diff --git a/AFNetworking/AFHTTPRequestOperationManager.h b/AFNetworking/AFHTTPRequestOperationManager.h
index e1fb041b5e..a92c6e504c 100644
--- a/AFNetworking/AFHTTPRequestOperationManager.h
+++ b/AFNetworking/AFHTTPRequestOperationManager.h
@@ -36,6 +36,14 @@
 #import "AFSecurityPolicy.h"
 #import "AFNetworkReachabilityManager.h"
 
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
 /**
  `AFHTTPRequestOperationManager` encapsulates the common patterns of communicating with a web application over HTTP, including request creation, response serialization, network reachability monitoring, and security, as well as request operation management.
 
diff --git a/AFNetworking/AFHTTPSessionManager.h b/AFNetworking/AFHTTPSessionManager.h
index bab8245f7e..e77da03431 100644
--- a/AFNetworking/AFHTTPSessionManager.h
+++ b/AFNetworking/AFHTTPSessionManager.h
@@ -32,6 +32,14 @@
 
 #import "AFURLSessionManager.h"
 
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
 /**
  `AFHTTPSessionManager` is a subclass of `AFURLSessionManager` with convenience methods for making HTTP requests. When a `baseURL` is provided, requests made with the `GET` / `POST` / et al. convenience methods can be made with relative paths.
 
diff --git a/AFNetworking/AFNetworkReachabilityManager.h b/AFNetworking/AFNetworkReachabilityManager.h
index 31ab79b5f8..a458d1051f 100644
--- a/AFNetworking/AFNetworkReachabilityManager.h
+++ b/AFNetworking/AFNetworkReachabilityManager.h
@@ -23,6 +23,14 @@
 #import <Foundation/Foundation.h>
 #import <SystemConfiguration/SystemConfiguration.h>
 
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
 typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {
     AFNetworkReachabilityStatusUnknown          = -1,
     AFNetworkReachabilityStatusNotReachable     = 0,
diff --git a/AFNetworking/AFURLConnectionOperation.h b/AFNetworking/AFURLConnectionOperation.h
index 7a5eccfa8e..b4041a4547 100644
--- a/AFNetworking/AFURLConnectionOperation.h
+++ b/AFNetworking/AFURLConnectionOperation.h
@@ -27,6 +27,14 @@
 #import "AFURLResponseSerialization.h"
 #import "AFSecurityPolicy.h"
 
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
 /**
  `AFURLConnectionOperation` is a subclass of `NSOperation` that implements `NSURLConnection` delegate methods.
 
diff --git a/AFNetworking/AFURLSessionManager.h b/AFNetworking/AFURLSessionManager.h
index 966c3e8a5c..5a3b75fae7 100644
--- a/AFNetworking/AFURLSessionManager.h
+++ b/AFNetworking/AFURLSessionManager.h
@@ -27,6 +27,14 @@
 #import "AFSecurityPolicy.h"
 #import "AFNetworkReachabilityManager.h"
 
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
 /**
  `AFURLSessionManager` creates and manages an `NSURLSession` object based on a specified `NSURLSessionConfiguration` object, which conforms to `<NSURLSessionTaskDelegate>`, `<NSURLSessionDataDelegate>`, `<NSURLSessionDownloadDelegate>`, and `<NSURLSessionDelegate>`.