diff --git a/cmake/QtHeadersClean.cmake b/cmake/QtHeadersClean.cmake
index 53cd00358c4..58c471b1d23 100644
--- a/cmake/QtHeadersClean.cmake
+++ b/cmake/QtHeadersClean.cmake
@@ -23,6 +23,7 @@ function(qt_internal_add_headersclean_target module_target module_headers)
                  -DQT_NO_CAST_FROM_ASCII
                  -DQT_NO_URL_CAST_FROM_STRING
                  -DQT_NO_CAST_FROM_BYTEARRAY
+                 -DQT_NO_CONTEXTLESS_CONNECT
                  -DQT_NO_KEYWORDS
                  -DQT_TYPESAFE_FLAGS
                  -DQT_USE_QSTRINGBUILDER