diff --git a/usr.bin/chat/Makefile b/usr.bin/chat/Makefile
index 696070488b1f..93475aa77338 100644
--- a/usr.bin/chat/Makefile
+++ b/usr.bin/chat/Makefile
@@ -2,6 +2,7 @@
 
 PROG=	chat
 MAN=	chat.8
+CFLAGS+=-fno-builtin-logf
 
 #as per policies section in handbook
 MAINTAINER=	peter@freebsd.org