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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 46f9725ce36..e068e44871d 100644
--- a/string.c
+++ b/string.c
@@ -829,7 +829,7 @@ rb_str_succ(orig)
memmove(s+1, s, RSTRING(str)->len - n);
*s = c;
RSTRING(str)->len += 1;
-
+ RSTRING(str)->ptr[RSTRING(str)->len] = '\0';
}
return str;