--- src/usr.bin/make/str.c	2005/01/24 05:12:58	1.17
+++ src/usr.bin/make/str.c	2005/01/24 05:13:58	1.18
@@ -413,7 +413,7 @@ Str_SYSVSubst(Buffer *buf, const char *p
 
     if ((m = strchr(pat, '%')) != NULL) {
 	/* Copy the prefix */
-	Buf_AddBytes(buf, m - pat, (const Byte *)pat);
+	Buf_AppendRange(buf, pat, m);
 	/* skip the % */
 	pat = m + 1;
     }