diff --git a/lib/sinatra/swagger-exposer/processing/swagger-response-processor.rb b/lib/sinatra/swagger-exposer/processing/swagger-response-processor.rb
index 713812c..36ef2da 100644
--- a/lib/sinatra/swagger-exposer/processing/swagger-response-processor.rb
+++ b/lib/sinatra/swagger-exposer/processing/swagger-response-processor.rb
@@ -32,8 +32,8 @@ def useful?
         def validate_response(response_body)
           parsed_response_body = nil
           begin
-            parsed_response_body = JSON.parse(response_body)
-          rescue JSON::ParserError => e
+            parsed_response_body = ::JSON.parse(response_body)
+          rescue ::JSON::ParserError => e
             raise SwaggerInvalidException.new("Response is not a valid json [#{response_body}]")
           end
           if @processor
@@ -44,4 +44,4 @@ def validate_response(response_body)
       end
     end
   end
-end
\ No newline at end of file
+end