diff --git a/cmake/QtIRCommandLineHelpers.cmake b/cmake/QtIRCommandLineHelpers.cmake
index dbd67332..d3569dd7 100644
--- a/cmake/QtIRCommandLineHelpers.cmake
+++ b/cmake/QtIRCommandLineHelpers.cmake
@@ -146,7 +146,7 @@ macro(qt_ir_commandline_option name)
         AND "${commandline_option_${arg_SHORT_NAME}_type}" STREQUAL "")
         set(unsupported "")
         if(arg_UNSUPPORTED)
-            set(unsupported "${arg_UNSUPPORTED}")
+            set(unsupported "UNSUPPORTED")
         endif()
 
         set(common "")