1 files changed, 1 insertions, 1 deletions
diff --git a/array.c b/array.c
index 03647f81fd..a5772d55eb 100644
--- a/array.c
+++ b/array.c
@@ -957,7 +957,6 @@ rb_ary_update(ary, beg, len, rpl)
 	len = RARRAY(ary)->len - beg;
     }
 
-    rb_ary_modify(ary);
     if (NIL_P(rpl)) {
 	rlen = 0;
     }
@@ -965,6 +964,7 @@ 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;