diff --git a/AFNetworking/AFURLResponseSerialization.m b/AFNetworking/AFURLResponseSerialization.m
index fe1fc06b13..5e4679928d 100755
--- a/AFNetworking/AFURLResponseSerialization.m
+++ b/AFNetworking/AFURLResponseSerialization.m
@@ -115,7 +115,9 @@ - (BOOL)validateResponse:(NSHTTPURLResponse *)response
     NSError *validationError = nil;
 
     if (response && [response isKindOfClass:[NSHTTPURLResponse class]]) {
-        if (self.acceptableContentTypes && ![self.acceptableContentTypes containsObject:[response MIMEType]]) {
+        if (self.acceptableContentTypes && ![self.acceptableContentTypes containsObject:[response MIMEType]] &&
+            !([response MIMEType] == nil && [data length] == 0)) {
+
             if ([data length] > 0 && [response URL]) {
                 NSMutableDictionary *mutableUserInfo = [@{
                                                           NSLocalizedDescriptionKey: [NSString stringWithFormat:NSLocalizedStringFromTable(@"Request failed: unacceptable content-type: %@", @"AFNetworking", nil), [response MIMEType]],
diff --git a/Tests/Tests/AFHTTPResponseSerializationTests.m b/Tests/Tests/AFHTTPResponseSerializationTests.m
index 5078867580..a3aae2255c 100644
--- a/Tests/Tests/AFHTTPResponseSerializationTests.m
+++ b/Tests/Tests/AFHTTPResponseSerializationTests.m
@@ -50,6 +50,34 @@ - (void)testThatAFHTTPResponseSerializationHandlesAll2XXCodes {
     }];
 }
 
+- (void)testThatAFHTTPResponseSerializationSucceedsWith205WithNoResponseContentTypeAndNoResponseData {
+    NSInteger statusCode = 205;
+    NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:self.baseURL statusCode:statusCode HTTPVersion:@"1.1" headerFields:@{}];
+
+    XCTAssert([self.responseSerializer.acceptableStatusCodes containsIndex:statusCode], @"Status code %@ should be acceptable", @(statusCode));
+
+    NSError *error = nil;
+    self.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
+
+    XCTAssertTrue([self.responseSerializer validateResponse:response data:nil error:&error]);
+    XCTAssertNil(error, @"Error handling status code %@", @(statusCode));
+
+    XCTAssertFalse([self.responseSerializer validateResponse:response data:[@"test" dataUsingEncoding:NSUTF8StringEncoding] error:&error]);
+}
+
+- (void)testThatAFHTTPResponseSerializationFailsWith205WithNoResponseContentTypeAndResponseData {
+    NSInteger statusCode = 205;
+    NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:self.baseURL statusCode:statusCode HTTPVersion:@"1.1" headerFields:@{}];
+
+    XCTAssert([self.responseSerializer.acceptableStatusCodes containsIndex:statusCode], @"Status code %@ should be acceptable", @(statusCode));
+
+    NSError *error = nil;
+    self.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
+
+    XCTAssertFalse([self.responseSerializer validateResponse:response data:[@"test" dataUsingEncoding:NSUTF8StringEncoding] error:&error]);
+    XCTAssertNotNil(error, @"Error handling status code %@", @(statusCode));
+}
+
 - (void)testThatAFHTTPResponseSerializationFailsAll4XX5XXStatusCodes {
     NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(400, 200)];
     [indexSet enumerateIndexesUsingBlock:^(NSUInteger statusCode, BOOL *stop) {