diff --git a/AFNetworking/AFHTTPClient.h b/AFNetworking/AFHTTPClient.h
index 5551f5d..90694f5 100644
--- a/AFNetworking/AFHTTPClient.h
+++ b/AFNetworking/AFHTTPClient.h
@@ -145,6 +145,11 @@ typedef enum {
 @property (nonatomic, assign) AFURLConnectionOperationSSLPinningMode defaultSSLPinningMode;
 #endif
 
+/**
+ The flag to determine if each `AFHTTPRequestOperation` that will be enqueued with `enqueueHTTPRequestOperation:` should accept an invalid SSL certificate. If `_AFNETWORKING_ALLOW_INVALID_SSL_CERTIFICATES_` is set, this property defaults to YES for backwards compatibility support. Otherwise, this property defaults to NO.
+ */
+@property (nonatomic,assign) BOOL allowInvalidSSLCertificate;
+
 ///---------------------------------------------
 /// @name Creating and Initializing HTTP Clients
 ///---------------------------------------------
diff --git a/AFNetworking/AFHTTPClient.m b/AFNetworking/AFHTTPClient.m
index bd0cab2..9c3cd3c 100644
--- a/AFNetworking/AFHTTPClient.m
+++ b/AFNetworking/AFHTTPClient.m
@@ -263,6 +263,11 @@ NSArray * AFQueryStringPairsFromKeyAndValue(NSString *key, id value) {
     self.operationQueue = [[NSOperationQueue alloc] init];
 	[self.operationQueue setMaxConcurrentOperationCount:NSOperationQueueDefaultMaxConcurrentOperationCount];
 
+    //This ifdef has been added for backwards compatibility purposes
+#ifdef _AFNETWORKING_ALLOW_INVALID_SSL_CERTIFICATES_
+    self.allowInvalidSSLCertificate = YES;
+#endif
+    
     return self;
 }