diff --git a/libkdecorations/kdecoration_plugins_p.cpp b/libkdecorations/kdecoration_plugins_p.cpp
index 952baa3e92..c783b4c2e2 100644
--- a/libkdecorations/kdecoration_plugins_p.cpp
+++ b/libkdecorations/kdecoration_plugins_p.cpp
@@ -251,6 +251,8 @@ bool KDecorationPlugins::loadPlugin(QString nameStr)
     pluginStr = nameStr;
 
     // For clients in kdeartwork
+#warning insertCatalog needs porting
+#if KWIN_QT5_PORTING
     QString catalog = nameStr;
     catalog.replace("kwin3_", "kwin_");
     KGlobal::locale()->insertCatalog(catalog);
@@ -260,6 +262,7 @@ bool KDecorationPlugins::loadPlugin(QString nameStr)
     KGlobal::locale()->insertCatalog("kwin_clients");
     // For clients in kdeartwork
     KGlobal::locale()->insertCatalog("kwin_art_clients");
+#endif
 
     old_library = oldLibrary; // save for delayed destroying
     old_fact = oldFactory;
diff --git a/main.cpp b/main.cpp
index 6c8e96691a..5304e0c4b7 100644
--- a/main.cpp
+++ b/main.cpp
@@ -546,9 +546,12 @@ KDE_EXPORT int kdemain(int argc, char * argv[])
     ksmserver.resumeStartup(KWIN_NAME);
     KWin::SessionManager weAreIndeed;
     KWin::SessionSaveDoneHelper helper;
+#warning insertCatalog needs porting
+#if KWIN_QT5_PORTING
     KGlobal::locale()->insertCatalog("kwin_effects");
     KGlobal::locale()->insertCatalog("kwin_scripts");
     KGlobal::locale()->insertCatalog("kwin_scripting");
+#endif
 
     // Announce when KWIN_DIRECT_GL is set for above HACK
     if (qstrcmp(qgetenv("KWIN_DIRECT_GL"), "1") == 0)