diff --git a/sbin/dhclient/conflex.c b/sbin/dhclient/conflex.c
index 39409a96e81b..c33019173833 100644
--- a/sbin/dhclient/conflex.c
+++ b/sbin/dhclient/conflex.c
@@ -104,7 +104,7 @@ get_char(FILE *cfile)
 			lpos = 1;
 			cur_line[0] = 0;
 		} else if (c != EOF) {
-			if (lpos <= 81) {
+			if (lpos < sizeof(line1)) {
 				cur_line[lpos - 1] = c;
 				cur_line[lpos] = 0;
 			}