follow-up for a54c717c7a74b91a3cdf20742c355e3ea42052d1.

1 files changed, 4 insertions, 0 deletions

diff --git a/string.c b/string.c
index 5af25b875e..97c570de31 100644
--- a/string.c
+++ b/string.c
@@ -1938,7 +1938,11 @@ rb_str_init(int argc, VALUE *argv, VALUE str)
                 /* make noembed always */
                 const size_t size = (size_t)capa + termlen;
                 const char *const old_ptr = RSTRING_PTR(str);
+#if USE_RVARGC
                 const size_t osize = RSTRING_LEN(str) + TERM_LEN(str);
+#else
+                const size_t osize = RSTRING_EMBED_LEN_MAX + 1;
+#endif
                 char *new_ptr = ALLOC_N(char, size);
                 if (STR_EMBED_P(str)) RUBY_ASSERT((long)osize <= str_embed_capa(str));
                 memcpy(new_ptr, old_ptr, osize < size ? osize : size);