diff --git a/uri.cpp.rl b/uri.cpp.rl
index f5753459..a02b7176 100644
--- a/uri.cpp.rl
+++ b/uri.cpp.rl
@@ -28,7 +28,7 @@
 %%{
     machine uri;
 
-    action trace { std::cerr << *p; }
+    action trace { if (0) std::cerr << *p; }
     action success {__success = true; }
     action failure {__success = false; }