1 files changed, 1 insertions, 1 deletions
diff --git a/pack.c b/pack.c
index 8d0a70473b..718f977d35 100644
--- a/pack.c
+++ b/pack.c
@@ -901,7 +901,7 @@ pack_pack(VALUE ary, VALUE fmt)
 	    ptr = RSTRING_PTR(from);
 	    plen = RSTRING_LEN(from);
 
-	    if (len == 0) {
+	    if (len == 0 && type == 'm') {
 		encodes(res, ptr, plen, type, 0);
 		ptr += plen;
 		break;