diff --git a/src/wayland/transaction.h b/src/wayland/transaction.h
index 00d76f630a..c03bb91986 100644
--- a/src/wayland/transaction.h
+++ b/src/wayland/transaction.h
@@ -18,7 +18,7 @@ namespace KWin
 {
 
 class SurfaceInterface;
-class SurfaceState;
+struct SurfaceState;
 class Transaction;
 
 /**