1 files changed, 1 insertions, 1 deletions
diff --git a/array.c b/array.c
index 6df82f7faa..2e9d927f6a 100644
--- a/array.c
+++ b/array.c
@@ -501,7 +501,7 @@ rb_ary_shift(ary)
     rb_ary_modify_check(ary);
     if (RARRAY(ary)->len == 0) return Qnil;
     top = RARRAY(ary)->ptr[0];
-    if (RARRAY_LEN(ary) < ARY_DEFAULT_SIZE) {
+    if (RARRAY_LEN(ary) < ARY_DEFAULT_SIZE && !FL_TEST(ary, ELTS_SHARED)) {
 	MEMMOVE(RARRAY_PTR(ary), RARRAY_PTR(ary)+1, VALUE, RARRAY_LEN(ary));
     }
     else {