diff --git a/src/gsiqt/qtbasic/gsiQtUiToolsExternals.h b/src/gsiqt/qtbasic/gsiQtUiToolsExternals.h
index 49462cbed..3b3c740c9 100644
--- a/src/gsiqt/qtbasic/gsiQtUiToolsExternals.h
+++ b/src/gsiqt/qtbasic/gsiQtUiToolsExternals.h
@@ -21,7 +21,7 @@
 */
 
 #if !defined(HAVE_QT_UITOOLS)
-#  defined FORCE_LINK_GSI_QTUITOOLS
+#  define FORCE_LINK_GSI_QTUITOOLS
 #elif QT_VERSION >= 0x050000
 #  include "../qt5/QtUiTools/gsiQtExternals.h"
 #else