diff --git a/config/qt5/__init__.py b/config/qt5/__init__.py
index cb369bf..574c5aa 100644
--- a/config/qt5/__init__.py
+++ b/config/qt5/__init__.py
@@ -763,7 +763,7 @@ def generate(env):
         QT5_MOCDEFPREFIX = '-D',
         QT5_MOCDEFSUFFIX = '',
         QT5_MOCDEFINES = '${_defines(QT5_MOCDEFPREFIX, CPPDEFINES, '
-        'QT5_MOCDEFSUFFIX, __env__)}',
+        'QT5_MOCDEFSUFFIX, __env__, TARGET, SOURCE)}',
         QT5_MOCCPPPATH = [],
         QT5_MOCINCFLAGS = '$( ${_concat(QT5_MOCINCPREFIX, QT5_MOCCPPPATH, '
         'INCSUFFIX, __env__, RDirs)} $)',