diff --git a/plugins/fastlane-plugin-ios_cd/lib/fastlane/plugin/ios_cd/helper/ios_cd_helper.rb b/plugins/fastlane-plugin-ios_cd/lib/fastlane/plugin/ios_cd/helper/ios_cd_helper.rb
index 4ac0a7e..8280439 100644
--- a/plugins/fastlane-plugin-ios_cd/lib/fastlane/plugin/ios_cd/helper/ios_cd_helper.rb
+++ b/plugins/fastlane-plugin-ios_cd/lib/fastlane/plugin/ios_cd/helper/ios_cd_helper.rb
@@ -57,7 +57,7 @@ module Fastlane
       end
 
       # Parse credential file
-      def parseIosCredentials(ios_directory)
+      def self.parseIosCredentials(ios_directory)
         if File.exist?("#{ios_directory}/ios_crendentials.json")
           # Read file and decrypt it
           file = File.read("#{ios_directory}/ios_crendentials.json")