diff --git a/usr.bin/grep/Makefile b/usr.bin/grep/Makefile
index a6f61b4f9f01..027e382dca46 100644
--- a/usr.bin/grep/Makefile
+++ b/usr.bin/grep/Makefile
@@ -48,6 +48,7 @@ MLINKS+=	grep.1 egrep.1 \
 		grep.1 fgrep.1 \
 		grep.1 rgrep.1
 
+CFLAGS+=	-DWITH_INTERNAL_NOSPEC
 CFLAGS.gcc+= --param max-inline-insns-single=500
 
 .if !defined(BOOTSTRAPPING)