diff --git a/AFNetworking/AFURLConnectionOperation.m b/AFNetworking/AFURLConnectionOperation.m
index fa4b488..8c4edf2 100644
--- a/AFNetworking/AFURLConnectionOperation.m
+++ b/AFNetworking/AFURLConnectionOperation.m
@@ -550,13 +550,13 @@ didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
         if ([challenge previousFailureCount] == 0) {
             NSURLCredential *credential = nil;
 
-            NSString *username = [[self.request URL] user];
+            NSString *user = [[self.request URL] user];
             NSString *password = [[self.request URL] password];
 
-            if (username && password) {
-                credential = [NSURLCredential credentialWithUser:username password:password persistence:NSURLCredentialPersistenceNone];
-            } else if (username) {
-                credential = [[[NSURLCredentialStorage sharedCredentialStorage] credentialsForProtectionSpace:[challenge protectionSpace]] objectForKey:username];
+            if (user && password) {
+                credential = [NSURLCredential credentialWithUser:user password:password persistence:NSURLCredentialPersistenceNone];
+            } else if (user) {
+                credential = [[[NSURLCredentialStorage sharedCredentialStorage] credentialsForProtectionSpace:[challenge protectionSpace]] objectForKey:user];
             } else {
                 credential = [[NSURLCredentialStorage sharedCredentialStorage] defaultCredentialForProtectionSpace:[challenge protectionSpace]];
             }