diff --git a/lib/prometheus/middleware/collector.rb b/lib/prometheus/middleware/collector.rb
index 65de3d17..dddc8ed8 100644
--- a/lib/prometheus/middleware/collector.rb
+++ b/lib/prometheus/middleware/collector.rb
@@ -67,15 +67,17 @@ def trace(env)
       end
 
       def record(env, code, duration)
+        path = env[Rack::SCRIPT_NAME] + env[Rack::PATH_INFO]
+
         counter_labels = {
           code:   code,
           method: env['REQUEST_METHOD'].downcase,
-          path:   strip_ids_from_path(env['PATH_INFO']),
+          path:   strip_ids_from_path(path),
         }
 
         duration_labels = {
           method: env['REQUEST_METHOD'].downcase,
-          path:   strip_ids_from_path(env['PATH_INFO']),
+          path:   strip_ids_from_path(path),
         }
 
         @requests.increment(labels: counter_labels)