diff --git a/src/bin/diffutils/lib/regex.c b/src/bin/diffutils/lib/regex.c
index 6daec76fbd..efe2a71bc2 100644
--- a/src/bin/diffutils/lib/regex.c
+++ b/src/bin/diffutils/lib/regex.c
@@ -23,6 +23,13 @@
   #pragma alloca
 #endif
 
+
+/********************************************/
+/* Remove this to enable debugging in regex */
+#undef DEBUG
+/********************************************/
+
+
 #undef	_GNU_SOURCE
 #define _GNU_SOURCE