1 files changed, 2 insertions, 2 deletions
diff --git a/eval.c b/eval.c
index cfd90f8e95..f802f07842 100644
--- a/eval.c
+++ b/eval.c
@@ -8510,13 +8510,13 @@ proc_to_s(self)
     if ((node = data->frame.node) || (node = data->body)) {
 	len += strlen(node->nd_file) + 2 + (SIZEOF_LONG*CHAR_BIT-NODE_LSHIFT)/3;
 	str = rb_str_new(0, len);
-	snprintf(RSTRING(str)->ptr, len,
+	snprintf(RSTRING(str)->ptr, len+1,
 		 "#<%s:0x%.*lx@%s:%d>", cname, w, (VALUE)data->body,
 		 node->nd_file, nd_line(node));
     }
     else {
 	str = rb_str_new(0, len);
-	snprintf(RSTRING(str)->ptr, len,
+	snprintf(RSTRING(str)->ptr, len+1,
 		 "#<%s:0x%.*lx>", cname, w, (VALUE)data->body);
     }
     RSTRING(str)->len = strlen(RSTRING(str)->ptr);