diff --git a/AFOAuth2Client/AFOAuth2Client.m b/AFOAuth2Client/AFOAuth2Client.m
index db7a1fda..4ac3e900 100644
--- a/AFOAuth2Client/AFOAuth2Client.m
+++ b/AFOAuth2Client/AFOAuth2Client.m
@@ -297,9 +297,11 @@ + (BOOL)storeCredential:(AFOAuthCredential *)credential
     NSData *data = [NSKeyedArchiver archivedDataWithRootObject:credential];
     [updateDictionary setObject:data forKey:(__bridge id)kSecValueData];
     
-    if( securityAccessibility )
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 43000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)
+    if( securityAccessibility && &kSecAttrAccessible != NULL )
         [updateDictionary setObject:securityAccessibility forKey:(__bridge id)kSecAttrAccessible];
-
+#endif
+    
     OSStatus status;
     BOOL exists = ([self retrieveCredentialWithIdentifier:identifier] != nil);