diff --git a/src/cmr/tu.c b/src/cmr/tu.c
index d744db6e..431b6a1a 100644
--- a/src/cmr/tu.c
+++ b/src/cmr/tu.c
@@ -1,4 +1,4 @@
-#define CMR_DEBUG /* Uncomment to debug this file. */
+// #define CMR_DEBUG /* Uncomment to debug this file. */
 
 #include <cmr/tu.h>