diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9620cf0..a57557b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -59,6 +59,15 @@ the Mapbox APIs' own response bodies are not.
   this release should be able to find it. Both are now covered by tests
   against RFC 7636, which they were not before.
 
+- Both installers now honour `MAPBOX_CLI_NO_TELEMETRY`, the name the binary
+  reads. They were left on the old `DISABLE_TELEMETRY` when the binary was
+  renamed, so neither name silenced both halves: the documented variable
+  stopped the CLI's markers but not the installer's, and the old one did the
+  reverse. `DISABLE_TELEMETRY` keeps working **in the installers only** — the
+  binary's break was announced, and a script fetched and run in one line has
+  no release notes in front of the reader, so breaking an opt-out there would
+  have happened silently. When both are set the new name wins.
+
 ## 0.1.8 - 2026-09-14
 
 Initial beta release. The next release is `0.2.0`.
diff --git a/scripts/install.ps1 b/scripts/install.ps1
index 8b657b0..0ef900b 100644
--- a/scripts/install.ps1
+++ b/scripts/install.ps1
@@ -86,21 +86,33 @@
     # because this value comes from the environment and ends up in a header.
     $InstallSource = $env:MAPBOX_CLI_INSTALL_SOURCE
 
-    # The switch src/http.rs honours for the CLI's own User-Agent, read here
-    # the same way, because someone who put DISABLE_TELEMETRY=1 in a Dockerfile
-    # and then runs `irm ... | iex` in the same file has already said which way
-    # they want it. The product token above survives it - the equivalent of
+    # The switch src/telemetry.rs honours for the CLI's own User-Agent, read
+    # here the same way, because someone who put it in a Dockerfile and then
+    # runs `irm ... | iex` in the same file has already said which way they
+    # want it. The product token above survives it - the equivalent of
     # `mapbox-cli/<version>` going out either way - and the triple and the
     # source tag are what it drops.
     #
+    # Two names, and only the binary dropped the old one.
+    # MAPBOX_CLI_NO_TELEMETRY is the documented switch; DISABLE_TELEMETRY is
+    # what it was called before, and this script still honours it. The rename
+    # was announced as breaking for the binary; nothing announced it for the
+    # installers, which are fetched and run in one line with no release notes
+    # in front of the reader - and breaking an opt-out is the one change that
+    # must not happen quietly. So both work here, and the new name wins when
+    # both are set. See mapbox/mapbox-cli-private#140.
+    #
     # Unset, empty or whitespace is a cleared variable. `0`, `f`, `false`, `n`,
     # `no` and `off` are clap's false spellings, the same reading this script
-    # already gives MAPBOX_NO_MODIFY_PATH, so DISABLE_TELEMETRY=0 is someone
-    # declining the opt-out rather than taking it. Anything else opts out,
-    # including a spelling nobody planned for: the safe reading of a value we
-    # do not know, on a variable by that name, is the one that sends less.
+    # already gives MAPBOX_NO_MODIFY_PATH, so a `0` is someone declining the
+    # opt-out rather than taking it. Anything else opts out, including a
+    # spelling nobody planned for: the safe reading of a value we do not know,
+    # on a variable by that name, is the one that sends less.
     $TelemetryAllowed = $true
-    $disableTelemetry = $env:DISABLE_TELEMETRY
+    $disableTelemetry = $env:MAPBOX_CLI_NO_TELEMETRY
+    if ($null -eq $disableTelemetry) {
+        $disableTelemetry = $env:DISABLE_TELEMETRY
+    }
     if ($null -ne $disableTelemetry) {
         $disableTelemetry = $disableTelemetry.Trim().ToLowerInvariant()
         $TelemetryAllowed = (
diff --git a/scripts/install.sh b/scripts/install.sh
index 90e2319..17627ef 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -62,24 +62,45 @@ USER_AGENT='mapbox-cli-install/1'
 # header.
 INSTALL_SOURCE="${MAPBOX_CLI_INSTALL_SOURCE:-}"
 
-# The switch `src/http.rs` honours for the CLI's own User-Agent, read here the
-# same way, because someone who put DISABLE_TELEMETRY=1 in a Dockerfile and
-# then pipes this script into sh in the same file has already said which way
-# they want it. The product token above is what survives it — the equivalent of
+# The switch `src/telemetry.rs` honours for the CLI's own User-Agent, read here
+# the same way, because someone who put it in a Dockerfile and then pipes this
+# script into sh in the same file has already said which way they want it. The
+# product token above is what survives it — the equivalent of
 # `mapbox-cli/<version>` going out either way — and everything appended below
 # is what it drops.
 #
+# **Two names, and only the binary dropped the old one.**
+# `MAPBOX_CLI_NO_TELEMETRY` is the documented switch; `DISABLE_TELEMETRY` is
+# what it was called before, and this script still honours it. The rename was
+# announced as breaking for the binary, so a `DISABLE_TELEMETRY=1` there
+# genuinely stopped working and the changelog says so. Nothing announced it for
+# the installers — this file is fetched and run in one line, so a reader has no
+# release notes in front of them — and breaking an opt-out is the one change
+# that must not happen quietly. So both work here, the new name wins when both
+# are set, and the old one keeps working for the Dockerfile the comment above
+# describes. See mapbox/mapbox-cli-private#140.
+#
 # Unset, empty, or whitespace: a cleared variable. `0`, `f`, `false`, `n`, `no`
-# and `off` are clap's false spellings, so DISABLE_TELEMETRY=0 is someone
-# declining the opt-out rather than taking it. Anything else opts out,
-# including a spelling nobody planned for: the safe reading of a value we do
-# not know, on a variable by that name, is the one that sends less.
+# and `off` are clap's false spellings, so a `0` is someone declining the
+# opt-out rather than taking it. Anything else opts out, including a spelling
+# nobody planned for: the safe reading of a value we do not know, on a variable
+# by that name, is the one that sends less.
 telemetry_allowed() {
-    # ASCII-only on purpose, the way `to_ascii_lowercase` is in src/http.rs:
-    # [:upper:]/[:lower:] would bring the locale into a decision about six
-    # ASCII spellings, and this script sets no LC_ALL.
+    # Set at all — even to empty, which is how a shell clears one — means the
+    # new name is the answer. Otherwise fall back, so the two never have to be
+    # reconciled: an explicit `MAPBOX_CLI_NO_TELEMETRY=0` beats a stale
+    # `DISABLE_TELEMETRY=1` left in an image from before the rename.
+    if [ -n "${MAPBOX_CLI_NO_TELEMETRY+set}" ]; then
+        _telemetry_switch=$MAPBOX_CLI_NO_TELEMETRY
+    else
+        _telemetry_switch=${DISABLE_TELEMETRY-}
+    fi
+
+    # ASCII-only on purpose, the way `to_ascii_lowercase` is in
+    # src/telemetry.rs: [:upper:]/[:lower:] would bring the locale into a
+    # decision about six ASCII spellings, and this script sets no LC_ALL.
     # shellcheck disable=SC2018,SC2019
-    case "$(printf '%s' "${DISABLE_TELEMETRY-}" |
+    case "$(printf '%s' "$_telemetry_switch" |
         tr 'A-Z' 'a-z' |
         sed 's/^[[:space:]]*//;s/[[:space:]]*$//')" in
         '' | 0 | f | false | n | no | off) return 0 ;;
diff --git a/scripts/test-install.ps1 b/scripts/test-install.ps1
index 518eb56..3c65437 100644
--- a/scripts/test-install.ps1
+++ b/scripts/test-install.ps1
@@ -386,9 +386,10 @@ function New-CaseEnv([string]$Name) {
     Clear-Env 'MAPBOX_CLI_AUTH'
     Clear-Env 'MAPBOX_TILESETS_CLI'
     Clear-Env 'MAPBOX_CLI_INSTALL_SOURCE'
-    # A developer with this set in their own shell would otherwise turn every
-    # marker case into a failure that looks like the marker broke.
+    # A developer with either of these set in their own shell would otherwise
+    # turn every marker case into a failure that looks like the marker broke.
     Clear-Env 'DISABLE_TELEMETRY'
+    Clear-Env 'MAPBOX_CLI_NO_TELEMETRY'
     # What install.ps1 reads to decide where it is running. Set explicitly so
     # the same case means the same thing on Windows and on the machine this is
     # written on.
@@ -513,6 +514,41 @@ try {
     Clear-Env 'DISABLE_TELEMETRY'
     Clear-Env 'MAPBOX_CLI_INSTALL_SOURCE'
 
+    Start-Case 'MAPBOX_CLI_NO_TELEMETRY is honoured, and outranks the old name'
+    New-CaseEnv 'telemetry-new-name'
+    $env:MAPBOX_CLI_INSTALL_SOURCE = 'dockerfile'
+    # The documented name, which the binary reads and this script did not until
+    # mapbox/mapbox-cli-private#140.
+    $env:MAPBOX_CLI_NO_TELEMETRY = '1'
+    [IO.File]::WriteAllText($RequestLog, '')
+    Invoke-Installer
+    Expect-Status 0 'exits 0 - the install is not what is being switched off'
+    $logged = @([IO.File]::ReadAllLines($RequestLog) | Where-Object { $_ })
+    $bare = @($logged | Where-Object { $_ -like "* $InstallerUa" })
+    Expect-Equal '2' ([string]$logged.Count) 'still made both requests'
+    Expect-Equal '2' ([string]$bare.Count) 'each carries the product token and nothing else'
+    # Both set and disagreeing. The new name is the documented one, so an
+    # explicit 0 on it beats a DISABLE_TELEMETRY=1 left in an image from before
+    # the rename - otherwise the old variable could never be retired.
+    $env:MAPBOX_CLI_NO_TELEMETRY = '0'
+    $env:DISABLE_TELEMETRY = '1'
+    [IO.File]::WriteAllText($RequestLog, '')
+    Invoke-Installer
+    $logged = @([IO.File]::ReadAllLines($RequestLog) | Where-Object { $_ })
+    $marked = @($logged | Where-Object { $_ -like "* $InstallerUa ($Target) src/dockerfile" })
+    Expect-Equal '2' ([string]$marked.Count) 'the new name wins when the two disagree'
+    # And the other direction, so precedence is pinned rather than implied.
+    $env:MAPBOX_CLI_NO_TELEMETRY = '1'
+    $env:DISABLE_TELEMETRY = '0'
+    [IO.File]::WriteAllText($RequestLog, '')
+    Invoke-Installer
+    $logged = @([IO.File]::ReadAllLines($RequestLog) | Where-Object { $_ })
+    $bare = @($logged | Where-Object { $_ -like "* $InstallerUa" })
+    Expect-Equal '2' ([string]$bare.Count) 'and wins in the opt-out direction too'
+    Clear-Env 'MAPBOX_CLI_NO_TELEMETRY'
+    Clear-Env 'DISABLE_TELEMETRY'
+    Clear-Env 'MAPBOX_CLI_INSTALL_SOURCE'
+
     Start-Case 'a checksum that does not match installs nothing'
     New-CaseEnv 'bad-sha'
     $env:MAPBOX_CLI_BASE_URL = "$($open.BaseUrl)/bad-sha-channel"
diff --git a/scripts/test-install.sh b/scripts/test-install.sh
index 2fe6217..bd396f5 100755
--- a/scripts/test-install.sh
+++ b/scripts/test-install.sh
@@ -531,9 +531,9 @@ new_case_env() { # case-name
     PATH="${CASE_SHIMS}:${SAFE_PATH}"
     unset MAPBOX_CLI_VERSION MAPBOX_CLI_AUTH MAPBOX_INSTALL_TILESETS MAPBOX_TILESETS_CLI
     unset MAPBOX_CLI_INSTALL_SOURCE
-    # A developer with this set in their own shell would otherwise turn every
-    # marker case into a failure that looks like the marker broke.
-    unset DISABLE_TELEMETRY
+    # A developer with either of these set in their own shell would otherwise
+    # turn every marker case into a failure that looks like the marker broke.
+    unset DISABLE_TELEMETRY MAPBOX_CLI_NO_TELEMETRY
     export MAPBOX_CLI_BASE_URL MAPBOX_INSTALL_DIR PATH
 }
 
@@ -658,6 +658,41 @@ expect_in_file "$CURL_LOG" "-A ${INSTALLER_UA} (${TARGET}" 'DISABLE_TELEMETRY=0
 expect_in_file "$CURL_LOG" ' src/dockerfile' 'and the tag comes back with it'
 unset MAPBOX_TEST_CURL_LOG DISABLE_TELEMETRY MAPBOX_CLI_INSTALL_SOURCE
 
+start 'MAPBOX_CLI_NO_TELEMETRY is honoured, and outranks the old name'
+new_case_env telemetry-new-name
+export MAPBOX_INSTALL_TILESETS=no
+export MAPBOX_CLI_INSTALL_SOURCE=dockerfile
+shim curl-recording curl
+CURL_LOG="${CASE_DIR}/curl-args"
+export MAPBOX_TEST_CURL_LOG="$CURL_LOG"
+
+# The documented name, which the binary reads and this script did not until
+# mapbox/mapbox-cli-private#140.
+: >"$CURL_LOG"
+export MAPBOX_CLI_NO_TELEMETRY=1
+run_piped && status=0 || status=$?
+expect_status 0 "$status" 'exits 0 — the install is not what is being switched off'
+expect_in_file "$CURL_LOG" "-A ${INSTALLER_UA} " 'still names the installer'
+expect_not_in_file "$CURL_LOG" "${INSTALLER_UA} (" 'no platform rides behind it'
+expect_not_in_file "$CURL_LOG" ' src/' 'and no source tag either'
+
+# Both set, disagreeing. The new name is the documented one, so an explicit
+# `0` on it beats a `DISABLE_TELEMETRY=1` left in an image from before the
+# rename — otherwise the old variable could never be retired.
+: >"$CURL_LOG"
+export MAPBOX_CLI_NO_TELEMETRY=0
+export DISABLE_TELEMETRY=1
+run_piped || true
+expect_in_file "$CURL_LOG" "-A ${INSTALLER_UA} (${TARGET}" 'the new name wins when the two disagree'
+
+# And the other direction, so precedence is pinned rather than implied.
+: >"$CURL_LOG"
+export MAPBOX_CLI_NO_TELEMETRY=1
+export DISABLE_TELEMETRY=0
+run_piped || true
+expect_not_in_file "$CURL_LOG" "${INSTALLER_UA} (" 'and wins in the opt-out direction too'
+unset MAPBOX_TEST_CURL_LOG MAPBOX_CLI_NO_TELEMETRY DISABLE_TELEMETRY MAPBOX_CLI_INSTALL_SOURCE
+
 start 'both installers send the same marker'
 # The one thing about this marker that cannot be checked by watching a request:
 # install.sh and install.ps1 each carry their own copy, because each is served