diff --git a/etg/app.py b/etg/app.py
index d73ab011..4ecbbf83 100644
--- a/etg/app.py
+++ b/etg/app.py
@@ -208,7 +208,7 @@ def run():
 
     c.find('GTKSuppressDiagnostics').setCppCode("""\
         #ifdef __WXGTK__
-            GTKSuppressDiagnostics(flags);
+            wxApp::GTKSuppressDiagnostics(flags);
         #endif
         """)