1 files changed, 3 insertions, 0 deletions
diff --git a/src/string.c b/src/string.c
index 510bd4e73..6c1988e92 100644
--- a/src/string.c
+++ b/src/string.c
@@ -2201,6 +2201,9 @@ mrb_str_to_inum(mrb_state *mrb, mrb_value str, mrb_int base, mrb_bool badcheck)
   s = mrb_string_value_ptr(mrb, str);
   if (s) {
     len = RSTRING_LEN(str);
+    if (badcheck && strlen(s) != len) {
+      mrb_raise(mrb, E_ARGUMENT_ERROR, "string contains null byte");
+    }
     if (s[len]) {    /* no sentinel somehow */
       struct RString *temp_str = str_new(mrb, s, len);
       s = RSTR_PTR(temp_str);