diff --git a/reactos/dll/win32/lsasrv/policy.c b/reactos/dll/win32/lsasrv/policy.c
index 47f8d1c8738..384dc6edf7e 100644
--- a/reactos/dll/win32/lsasrv/policy.c
+++ b/reactos/dll/win32/lsasrv/policy.c
@@ -252,7 +252,7 @@ LsarQueryAccountDomain(LSAPR_HANDLE PolicyHandle,
 {
     PLSAPR_POLICY_ACCOUNT_DOM_INFO p = NULL;
     PUNICODE_STRING DomainName;
-    ULONG AttributeSize;
+    ULONG AttributeSize = 0;
     NTSTATUS Status;
 
     *PolicyInformation = NULL;