diff --git a/cmake/QtModuleConfig.cmake.in b/cmake/QtModuleConfig.cmake.in
index 06a7daad71e..004e6a88515 100644
--- a/cmake/QtModuleConfig.cmake.in
+++ b/cmake/QtModuleConfig.cmake.in
@@ -58,7 +58,16 @@ if (NOT QT_NO_CREATE_TARGETS AND @INSTALL_CMAKE_NAMESPACE@@target@_FOUND)
     if(NOT @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS)
         set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS "")
     else()
-        list(TRANSFORM @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS PREPEND "-D")
+        set(updated_defs "")
+        foreach(def IN LISTS  @QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS)
+             if(def MATCHES "^[A-Za-z_]")
+                 list(APPEND updated_defs "-D${def}")
+             else()
+                 list(APPEND updated_defs "${def}")
+             endif()
+        endforeach()
+        set(@QT_CMAKE_EXPORT_NAMESPACE@@target@_DEFINITIONS "${updated_defs}")
+        unset(updated_defs)
     endif()
 
     get_target_property(@QT_CMAKE_EXPORT_NAMESPACE@@target@_COMPILE_DEFINITIONS