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-rw-r--r--string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index 4bc4ebfd99a..514488fd935 100644
--- a/string.c
+++ b/string.c
@@ -2570,7 +2570,7 @@ str_buf_cat(VALUE str, const char *ptr, long len)
rb_str_modify(str);
if (len == 0) return 0;
if (STR_EMBED_P(str)) {
- capa = RSTRING_EMBED_LEN_MAX + termlen - 1;
+ capa = RSTRING_EMBED_LEN_MAX + 1 - termlen;
sptr = RSTRING(str)->as.ary;
olen = RSTRING_EMBED_LEN(str);
}