diff --git a/reactos/ntoskrnl/mm/ARM3/expool.c b/reactos/ntoskrnl/mm/ARM3/expool.c
index 79e5ef95dc7..120050e6aca 100644
--- a/reactos/ntoskrnl/mm/ARM3/expool.c
+++ b/reactos/ntoskrnl/mm/ARM3/expool.c
@@ -248,7 +248,7 @@ VOID
 NTAPI
 ExpCheckPoolBlocks(IN PVOID Block)
 {
-    BOOLEAN FoundBlock;
+    BOOLEAN FoundBlock = FALSE;
     SIZE_T Size = 0;
     PPOOL_HEADER Entry;