diff --git a/lib/url.c b/lib/url.c
index b50ca8677105cd9238adc3e242130f2e2eb01e22..792ce777cf1273c95815eee7c6db84a1d6c075c0 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3444,8 +3444,8 @@ ConnectionExists(struct SessionHandle *data,
 
         /* Same for Proxy NTLM authentication */
         if(wantProxyNTLMhttp) {
-          /* Both check->proxyuser and check->proxypasswd could be NULL */
-          if(check->proxyuser == NULL || check->proxypasswd == NULL)
+          /* Both check->proxyuser and check->proxypasswd can be NULL */
+          if(!check->proxyuser || !check->proxypasswd)
             continue;
 
           if(!strequal(needle->proxyuser, check->proxyuser) ||