diff --git a/cmake/QtHeadersClean.cmake b/cmake/QtHeadersClean.cmake
index 9082f258d87..4ae076413d5 100644
--- a/cmake/QtHeadersClean.cmake
+++ b/cmake/QtHeadersClean.cmake
@@ -121,13 +121,7 @@ function(qt_internal_add_headersclean_target module_target module_headers)
         endif()
 
         if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-            list(APPEND hcleanFLAGS -Wzero-as-null-pointer-constant)
-            if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.5)
-                list(APPEND hcleanFLAGS -Wdouble-promotion)
-            endif()
-            if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.9)
-                list(APPEND hcleanFLAGS -Wfloat-conversion)
-            endif()
+            list(APPEND hcleanFLAGS -Wdouble-promotion -Wfloat-conversion)
         endif()
 
         if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang|IntelLLVM")