diff --git a/dlls/ntdll/om.c b/dlls/ntdll/om.c
index bc2ee9721a0..aba2301627d 100644
--- a/dlls/ntdll/om.c
+++ b/dlls/ntdll/om.c
@@ -174,7 +174,7 @@ NtQuerySecurityObject(
     PISECURITY_DESCRIPTOR_RELATIVE psd = pSecurityDescriptor;
     NTSTATUS status;
     unsigned int buffer_size = 512;
-    BOOLEAN need_more_memory = FALSE;
+    BOOLEAN need_more_memory;
 
     TRACE("(%p,0x%08x,%p,0x%08x,%p)\n",
 	Object, RequestedInformation, pSecurityDescriptor, Length, ResultLength);
@@ -185,6 +185,8 @@ NtQuerySecurityObject(
         if (!buffer)
             return STATUS_NO_MEMORY;
 
+        need_more_memory = FALSE;
+
         SERVER_START_REQ( get_security_object )
         {
             req->handle = Object;