diff --git a/cmake/QtHeadersClean.cmake b/cmake/QtHeadersClean.cmake
index b19990eac40..a0adbfcfabf 100644
--- a/cmake/QtHeadersClean.cmake
+++ b/cmake/QtHeadersClean.cmake
@@ -104,6 +104,7 @@ function(qt_internal_add_headersclean_target module_target module_headers)
 
         set(hcleanFLAGS -Wall -Wextra -Werror -Woverloaded-virtual -Wshadow -Wundef -Wfloat-equal
             -Wnon-virtual-dtor -Wpointer-arith -Wformat-security -Wno-long-long -Wno-variadic-macros
+            -fno-operator-names
             -pedantic-errors)
 
         if(QT_FEATURE_reduce_relocations AND UNIX)