diff --git a/AFNetworking/AFHTTPClient.m b/AFNetworking/AFHTTPClient.m
index 62416dc..03a9e5f 100644
--- a/AFNetworking/AFHTTPClient.m
+++ b/AFNetworking/AFHTTPClient.m
@@ -725,7 +725,7 @@ static inline NSString * AFMultipartFormFinalBoundary() {
     self.request = request;
     self.stringEncoding = encoding;
     
-    self.temporaryFilePath = [AFMultipartTemporaryFileDirectoryPath() stringByAppendingPathComponent:[NSString stringWithFormat:@"%lu", (long)[[self.request URL] hash]]];
+    self.temporaryFilePath = [AFMultipartTemporaryFileDirectoryPath() stringByAppendingPathComponent:[[NSProcessInfo processInfo] globallyUniqueString]];
     self.outputStream = [NSOutputStream outputStreamToFileAtPath:self.temporaryFilePath append:NO];
     
     NSRunLoop *runLoop = [NSRunLoop currentRunLoop];