diff --git a/src/effects/EffectUI.h b/src/effects/EffectUI.h
index 36e262ec3..b51cf70b2 100644
--- a/src/effects/EffectUI.h
+++ b/src/effects/EffectUI.h
@@ -212,7 +212,7 @@ private:
    DECLARE_EVENT_TABLE()
 };
 
-struct CommandContext;
+class CommandContext;
 
 namespace  EffectUI {