diff --git a/AFOAuth2Manager/AFOAuth2Manager.h b/AFOAuth2Manager/AFOAuth2Manager.h
index f6927dd7..ba2c2a95 100644
--- a/AFOAuth2Manager/AFOAuth2Manager.h
+++ b/AFOAuth2Manager/AFOAuth2Manager.h
@@ -107,7 +107,7 @@ NS_ASSUME_NONNULL_BEGIN
                                                  password:(NSString *)password
                                                     scope:(nullable NSString *)scope
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure;
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure;
 
 /**
  Creates and enqueues an `NSURLSessionTask` to authenticate against the server with a designated scope.
@@ -120,7 +120,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                     scope:(nullable NSString *)scope
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure;
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure;
 
 /**
  Creates and enqueues an `NSURLSessionTask` to authenticate against the server using the specified refresh token.
@@ -132,7 +132,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                              refreshToken:(NSString *)refreshToken
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure;
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure;
 
 /**
  Creates and enqueues an `NSURLSessionTask` to authenticate against the server with an authorization code, redirecting to a specified URI upon successful authentication.
@@ -146,7 +146,7 @@ NS_ASSUME_NONNULL_BEGIN
                                                      code:(NSString *)code
                                               redirectURI:(NSString *)uri
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure;
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure;
 
 /**
  Creates and enqueues an `NSURLSessionTask` to authenticate against the server with the specified parameters.
@@ -159,7 +159,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                parameters:(NSDictionary *)parameters
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure;
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure;
 
 @end
 
diff --git a/AFOAuth2Manager/AFOAuth2Manager.m b/AFOAuth2Manager/AFOAuth2Manager.m
index 88d83f11..55c74331 100644
--- a/AFOAuth2Manager/AFOAuth2Manager.m
+++ b/AFOAuth2Manager/AFOAuth2Manager.m
@@ -144,7 +144,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                  password:(NSString *)password
                                                     scope:(NSString *)scope
                                                   success:(void (^)(AFOAuthCredential * _Nonnull))success
-                                                  failure:(void (^)(NSError * _Nonnull))failure {
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull))failure {
     NSParameterAssert(username);
     NSParameterAssert(password);
 
@@ -163,7 +163,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                     scope:(NSString *)scope
                                                   success:(void (^)(AFOAuthCredential * _Nonnull))success
-                                                  failure:(void (^)(NSError * _Nonnull))failure {
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull))failure {
 
     NSMutableDictionary *parameters = [NSMutableDictionary dictionary];
     [parameters setValue:kAFOAuthClientCredentialsGrantType forKey:@"grant_type"];
@@ -179,7 +179,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                              refreshToken:(NSString *)refreshToken
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure
 {
     NSParameterAssert(refreshToken);
 
@@ -195,7 +195,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                      code:(NSString *)code
                                               redirectURI:(NSString *)uri
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure
 {
     NSParameterAssert(code);
     NSParameterAssert(uri);
@@ -212,7 +212,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
 - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
                                                parameters:(NSDictionary *)parameters
                                                   success:(void (^)(AFOAuthCredential *credential))success
-                                                  failure:(void (^)(NSError *error))failure
+                                                  failure:(void (^)(NSURLSessionDataTask * _Nullable task, NSError *error))failure
 {
     NSMutableDictionary *mutableParameters = [NSMutableDictionary dictionaryWithDictionary:parameters];
     if (!self.useHTTPBasicAuthentication) {
@@ -232,7 +232,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
 
         if ([responseObject valueForKey:@"error"]) {
             if (failure) {
-                failure(AFErrorFromRFC6749Section5_2Error(responseObject));
+                failure(task, AFErrorFromRFC6749Section5_2Error(responseObject));
             }
         }
 
@@ -265,7 +265,7 @@ - (NSURLSessionTask *)authenticateUsingOAuthWithURLString:(NSString *)URLString
 
     } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
         if (failure) {
-            failure(error);
+            failure(task, error);
         }
     }];