From f53f73f30ca390d27994e9092ff9b6b18aa615bf Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 6 Jan 2017 14:25:01 +0900
Subject: Should not deallocate shared string referring static; fix #3373

---
 src/string.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/string.c b/src/string.c
index ae2e5ccc8..d011f60ca 100644
--- a/src/string.c
+++ b/src/string.c
@@ -669,7 +669,7 @@ mrb_str_modify(mrb_state *mrb, struct RString *s)
   if (RSTR_SHARED_P(s)) {
     mrb_shared_string *shared = s->as.heap.aux.shared;
 
-    if (shared->refcnt == 1 && s->as.heap.ptr == shared->ptr) {
+    if (shared->nofree == 0 && shared->refcnt == 1 && s->as.heap.ptr == shared->ptr) {
       s->as.heap.ptr = shared->ptr;
       s->as.heap.aux.capa = shared->len;
       RSTR_PTR(s)[s->as.heap.len] = '\0';
-- 
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