diff --git a/cli/cmdlineparser.cpp b/cli/cmdlineparser.cpp
index 7da11321fa7..b1c2d3ac5b9 100644
--- a/cli/cmdlineparser.cpp
+++ b/cli/cmdlineparser.cpp
@@ -1106,10 +1106,14 @@ CmdLineParser::Result CmdLineParser::parseFromArgs(int argc, const char* const a
             // TODO: remove
             // these are loaded via external files and thus have Settings::PlatformFile set instead.
             // override the type so they behave like the regular platforms.
-            if (platform == "unix32-unsigned")
+            if (platform == "unix32-unsigned") {
                 mSettings.platform.type = Platform::Type::Unix32;
-            else if (platform == "unix64-unsigned")
+                mLogger.printMessage("The platform 'unix32-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix32 --funsigned-char' instead");
+            }
+            else if (platform == "unix64-unsigned") {
                 mSettings.platform.type = Platform::Type::Unix64;
+                mLogger.printMessage("The platform 'unix64-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix64 --funsigned-char' instead");
+            }
         }
 
         // Write results in results.plist
diff --git a/releasenotes.txt b/releasenotes.txt
index 792d2dcbc8c..806f9efca44 100644
--- a/releasenotes.txt
+++ b/releasenotes.txt
@@ -14,6 +14,8 @@ Changed interface:
 
 Deprecations:
 - Support for building with Qt 5 will be removed in Cppcheck 2.19.
+- The platform 'unix32-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix32 --funsigned-char' instead.
+- The platform 'unix64-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix64 --funsigned-char' instead.
 -
 
 Other:
diff --git a/test/testcmdlineparser.cpp b/test/testcmdlineparser.cpp
index 349d690e4f5..a22a20f2d73 100644
--- a/test/testcmdlineparser.cpp
+++ b/test/testcmdlineparser.cpp
@@ -1676,6 +1676,7 @@ class TestCmdlineParser : public TestFixture {
         ASSERT(settings->platform.set(Platform::Type::Unspecified));
         ASSERT_EQUALS_ENUM(CmdLineParser::Result::Success, parseFromArgs(argv));
         ASSERT_EQUALS(Platform::Type::Unix32, settings->platform.type);
+        ASSERT_EQUALS("cppcheck: The platform 'unix32-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix32 --funsigned-char' instead\n", logger->str());
     }
 
     void platformUnix64() {
@@ -1692,6 +1693,7 @@ class TestCmdlineParser : public TestFixture {
         ASSERT(settings->platform.set(Platform::Type::Unspecified));
         ASSERT_EQUALS_ENUM(CmdLineParser::Result::Success, parseFromArgs(argv));
         ASSERT_EQUALS(Platform::Type::Unix64, settings->platform.type);
+        ASSERT_EQUALS("cppcheck: The platform 'unix64-unsigned' has been deprecated and will be removed in Cppcheck 2.19. Please use '--platform=unix64 --funsigned-char' instead\n", logger->str());
     }
 
     void platformNative() {