diff --git a/kde-modules/KDEFrameworkCompilerSettings.cmake b/kde-modules/KDEFrameworkCompilerSettings.cmake
--- a/kde-modules/KDEFrameworkCompilerSettings.cmake
+++ b/kde-modules/KDEFrameworkCompilerSettings.cmake
@@ -54,6 +54,7 @@
                 -DQT_NO_CAST_FROM_BYTEARRAY
                 -DQT_NO_SIGNALS_SLOTS_KEYWORDS
                 -DQT_USE_QSTRINGBUILDER
+                -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT
                )
 
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")