diff --git a/reactos/include/ddk/winddk.h b/reactos/include/ddk/winddk.h
index 5433dbdac2d..9b205afa6c8 100644
--- a/reactos/include/ddk/winddk.h
+++ b/reactos/include/ddk/winddk.h
@@ -8685,8 +8685,8 @@ IoReuseIrp(
                                _InvokeOnCancel) \
 { \
   PIO_STACK_LOCATION _IrpSp; \
-  ASSERT(_InvokeOnSuccess || _InvokeOnError || _InvokeOnCancel ? \
-    _CompletionRoutine != NULL : TRUE); \
+  ASSERT((_InvokeOnSuccess) || (_InvokeOnError) || (_InvokeOnCancel) ? \
+    (_CompletionRoutine) != NULL : TRUE); \
   _IrpSp = IoGetNextIrpStackLocation(_Irp); \
   _IrpSp->CompletionRoutine = (PIO_COMPLETION_ROUTINE)(_CompletionRoutine); \
   _IrpSp->Context = (_Context); \