1 files changed, 1 insertions, 1 deletions
diff --git a/array.c b/array.c
index 8b9c62063a..3e55ca4e3b 100644
--- a/array.c
+++ b/array.c
@@ -1090,7 +1090,6 @@ rb_ary_update(ary, beg, len, rpl)
 	len = RARRAY(ary)->len - beg;
     }
 
-    rb_ary_modify(ary);
     if (rpl == Qundef) {
 	rlen = 0;
     }
@@ -1098,6 +1097,7 @@ rb_ary_update(ary, beg, len, rpl)
 	rpl = rb_ary_to_ary(rpl);
 	rlen = RARRAY(rpl)->len;
     }
+    rb_ary_modify(ary);
 
     if (beg >= RARRAY(ary)->len) {
 	len = beg + rlen;