diff --git a/internal/pipeline/resolver/cli.go b/internal/pipeline/resolver/cli.go
index 731895cd..dd880693 100644
--- a/internal/pipeline/resolver/cli.go
+++ b/internal/pipeline/resolver/cli.go
@@ -66,10 +66,11 @@ func parsePipelineArg(arg string, conf *config.Config) (org, pipeline string) {
 	return normalizeSlug(org), normalizeSlug(pipeline)
 }
 
-// normalizeSlug converts user input to a valid Buildkite slug. Slugs may only contain
-// lowercase letters, numbers and dashes, so this is a no-op on anything already valid.
-// It allows passing a name like "my_pipeline" (eg. from a repository directory name)
-// and matching the "my-pipeline" slug Buildkite derives from it.
+// normalizeSlug converts user input to a valid Buildkite slug. Slugs may contain
+// letters (of any case), numbers and dashes, so this is a no-op on anything already
+// valid. It allows passing a name like "my_pipeline" (eg. from a repository directory
+// name) and matching the "my-pipeline" slug Buildkite derives from it. Casing is
+// preserved since Buildkite organization and pipeline slugs may be mixed case.
 func normalizeSlug(s string) string {
-	return strings.ToLower(strings.ReplaceAll(s, "_", "-"))
+	return strings.ReplaceAll(s, "_", "-")
 }
diff --git a/internal/pipeline/resolver/cli_test.go b/internal/pipeline/resolver/cli_test.go
index 728a48f6..a2dd4294 100644
--- a/internal/pipeline/resolver/cli_test.go
+++ b/internal/pipeline/resolver/cli_test.go
@@ -35,10 +35,10 @@ func TestParsePipelineArg(t *testing.T) {
 			org:      "testing",
 			pipeline: "shared-gem",
 		},
-		"uppercase_normalized_to_lowercase": {
+		"casing_preserved": {
 			url:      "My_Org/Shared_Gem",
-			org:      "my-org",
-			pipeline: "shared-gem",
+			org:      "My-Org",
+			pipeline: "Shared-Gem",
 		},
 	}
 
diff --git a/internal/pipeline/resolver/resolver_test.go b/internal/pipeline/resolver/resolver_test.go
index 4ad95994..fe084daf 100644
--- a/internal/pipeline/resolver/resolver_test.go
+++ b/internal/pipeline/resolver/resolver_test.go
@@ -88,8 +88,8 @@ func TestWithOrg(t *testing.T) {
 		if err != nil {
 			t.Fatalf("unexpected error: %v", err)
 		}
-		if p.Org != "override-org" {
-			t.Fatalf("expected org override-org, got %s", p.Org)
+		if p.Org != "Override-Org" {
+			t.Fatalf("expected org Override-Org, got %s", p.Org)
 		}
 	})
 }