diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
index 63e63dc667..5ff36ac8f0 100644
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -3153,7 +3153,7 @@ extern KWINEFFECTS_EXPORT EffectsHandler* effects;
 
 inline
 WindowVertex::WindowVertex()
-    : px(0), py(0), tx(0), ty(0)
+    : px(0), py(0), ox(0), oy(0), tx(0), ty(0)
 {
 }