Index: head/usr.bin/grep/grep.c
===================================================================
--- head/usr.bin/grep/grep.c
+++ head/usr.bin/grep/grep.c
@@ -314,8 +314,12 @@
 	}
 	len = 0;
 	line = NULL;
-	while ((rlen = getline(&line, &len, f)) != -1)
+	while ((rlen = getline(&line, &len, f)) != -1) {
+		if (line[0] == '\0')
+			continue;
 		add_pattern(line, line[0] == '\n' ? 0 : (size_t)rlen);
+	}
+
 	free(line);
 	if (ferror(f))
 		err(2, "%s", fn);