diff --git "a/dll/win32/advapi32/reg/reg.c" "b/dll/win32/advapi32/reg/reg.c"
index 904ca010eca..4ec0df92139 100644
--- "a/dll/win32/advapi32/reg/reg.c"
+++ "b/dll/win32/advapi32/reg/reg.c"
@@ -1108,6 +1108,12 @@ RegCreateKeyExW(
 
     TRACE("RegCreateKeyExW() called\n");
 
+    if (lpSecurityAttributes && lpSecurityAttributes->nLength == 0)
+    {
+        lpSecurityAttributes = NULL;
+        ERR("lpSecurityAttributes->nLength was 0.\n");
+    }
+
     if (lpSecurityAttributes && lpSecurityAttributes->nLength != sizeof(SECURITY_ATTRIBUTES))
         return ERROR_INVALID_USER_BUFFER;