diff --git a/bin/sh/Makefile b/bin/sh/Makefile
index ee732f9ada9..7be7b989cbd 100644
--- a/bin/sh/Makefile
+++ b/bin/sh/Makefile
@@ -21,7 +21,7 @@ LDADD= -ll -ledit -ltermcap
 LFLAGS= -8	# 8-bit lex scanner for arithmetic
 CFLAGS+=-DSHELL -I. -I${.CURDIR}
 # for debug:
-# CFLAGS+= -g -DDEBUG=3
+# DEBUG_FLAGS+= -g -DDEBUG=3
 WARNS?=	2
 WFORMAT=0