diff --git a/reactos/ntoskrnl/mm/ppool.c b/reactos/ntoskrnl/mm/ppool.c
index 13b6e58da0c..8b086414fc5 100644
--- a/reactos/ntoskrnl/mm/ppool.c
+++ b/reactos/ntoskrnl/mm/ppool.c
@@ -910,7 +910,7 @@ static void
 RPoolFree ( PR_POOL pool, void* Addr )
 {
 	PR_USED UsedBlock;
-#ifndef R_RZ
+#if !R_RZ
 	rulong UsedSize;
 #endif
 	PR_FREE FreeBlock;