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-rw-r--r--array.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/array.c b/array.c
index fcbb7d4..bcdd29a 100644
--- a/array.c
+++ b/array.c
@@ -2080,6 +2080,7 @@ rb_ary_slice_bang(argc, argv, ary)
VALUE arg1, arg2;
long pos, len, orig_len;
+ rb_ary_modify_check(ary);
if (rb_scan_args(argc, argv, "11", &arg1, &arg2) == 2) {
pos = NUM2LONG(arg1);
len = NUM2LONG(arg2);