diff --git a/AFNetworking/AFHTTPClient.m b/AFNetworking/AFHTTPClient.m
index dbb66b5..a48ae00 100644
--- a/AFNetworking/AFHTTPClient.m
+++ b/AFNetworking/AFHTTPClient.m
@@ -451,7 +451,7 @@ static inline NSString * AFMultipartFormFinalBoundary() {
 
 - (void)appendPartWithFileData:(NSData *)data name:(NSString *)name fileName:(NSString *)fileName mimeType:(NSString *)mimeType {    
     NSMutableDictionary *mutableHeaders = [NSMutableDictionary dictionary];
-    [mutableHeaders setValue:[NSString stringWithFormat:@"file; name=\"%@\"; filename=\"%@\"", name, fileName] forKey:@"Content-Disposition"];
+    [mutableHeaders setValue:[NSString stringWithFormat:@"form-data; name=\"%@\"; filename=\"%@\"", name, fileName] forKey:@"Content-Disposition"];
     [mutableHeaders setValue:mimeType forKey:@"Content-Type"];
     
     [self appendPartWithHeaders:mutableHeaders body:data];