diff --git a/lib/rspec/openapi/extractors/rails.rb b/lib/rspec/openapi/extractors/rails.rb
index 5346aa0..56d14f5 100644
--- a/lib/rspec/openapi/extractors/rails.rb
+++ b/lib/rspec/openapi/extractors/rails.rb
@@ -73,8 +73,10 @@ def add_id(path, parameters)
     path
   end
 
-  def number_or_nil(string)
-    Integer(string || '')
+  # @param [String, Symbol] path_parameter
+  # @return [Integer, nil]
+  def number_or_nil(path_parameter)
+    Integer(path_parameter.to_s || '')
   rescue ArgumentError
     nil
   end