diff --git a/lib/generators/stimulus/stimulus_generator.rb b/lib/generators/stimulus/stimulus_generator.rb
index 5af2437..80e1e2f 100644
--- a/lib/generators/stimulus/stimulus_generator.rb
+++ b/lib/generators/stimulus/stimulus_generator.rb
@@ -17,6 +17,6 @@ def controller_name
     end
 
     def stimulus_attribute_value(controller_name)
-      controller_name.gsub(/\//, "--").gsub("_", "-")
+      controller_name.gsub(/\//, "--").tr("_", "-")
     end
 end
diff --git a/lib/stimulus/manifest.rb b/lib/stimulus/manifest.rb
index 709e594..c22137b 100644
--- a/lib/stimulus/manifest.rb
+++ b/lib/stimulus/manifest.rb
@@ -13,7 +13,7 @@ def import_and_register_controller(controllers_path, controller_path)
     controller_path = controller_path.relative_path_from(controllers_path).to_s
     module_path = controller_path.split('.').first
     controller_class_name = module_path.underscore.camelize.gsub(/::/, "__")
-    tag_name = module_path.remove(/_controller/).gsub(/_/, "-").gsub(/\//, "--")
+    tag_name = module_path.remove(/_controller/).tr("_", "-").gsub(/\//, "--")
 
     <<-JS