diff --git a/headers/private/kernel/vm/VMCache.h b/headers/private/kernel/vm/VMCache.h
index b3d08953b4..06bb0b9bba 100644
--- a/headers/private/kernel/vm/VMCache.h
+++ b/headers/private/kernel/vm/VMCache.h
@@ -365,6 +365,8 @@ vm_page::IncrementWiredCount()
 inline void
 vm_page::DecrementWiredCount()
 {
+	ASSERT(fWiredCount > 0);
+
 	if (--fWiredCount == 0)
 		cache_ref->cache->DecrementWiredPagesCount();
 }