diff --git a/reactos/include/ddk/ketypes.h b/reactos/include/ddk/ketypes.h
index 2ef9d375216..05ac6789037 100644
--- a/reactos/include/ddk/ketypes.h
+++ b/reactos/include/ddk/ketypes.h
@@ -23,7 +23,7 @@ typedef VOID (*PKKERNEL_ROUTINE)(struct _KAPC* Apc,
 	      
 typedef VOID (*PKRUNDOWN_ROUTINE)(struct _KAPC* Apc);	      
 
-typedef struct
+typedef struct _KWAIT_BLOCK
 /*
  * PURPOSE: Object describing the wait a thread is currently performing
  */