diff --git a/fastlane/lib/fastlane/actions/ensure_git_branch.rb b/fastlane/lib/fastlane/actions/ensure_git_branch.rb
index 7174657fa52..5639cb29d1b 100644
--- a/fastlane/lib/fastlane/actions/ensure_git_branch.rb
+++ b/fastlane/lib/fastlane/actions/ensure_git_branch.rb
@@ -35,7 +35,6 @@ def self.available_options
           FastlaneCore::ConfigItem.new(key: :branch,
                                        env_name: "FL_ENSURE_GIT_BRANCH_NAME",
                                        description: "The branch that should be checked for. String that can be either the full name of the branch or a regex e.g. `^feature\/.*$` to match",
-                                       is_string: true,
                                        default_value: 'master')
         ]
       end