diff --git a/reactos/include/ddk/winddk.h b/reactos/include/ddk/winddk.h
index 60ca7983e37..d3cf6623974 100644
--- a/reactos/include/ddk/winddk.h
+++ b/reactos/include/ddk/winddk.h
@@ -43,7 +43,7 @@ extern "C" {
 #define IN
 #define OUT
 #define OPTIONAL
-#define UNALLIGNED
+#define UNALIGNED
 
 #define CONST const