1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index 92f15dd294..7bf4006fdf 100644
--- a/string.c
+++ b/string.c
@@ -1366,7 +1366,7 @@ rb_str_format_m(VALUE str, VALUE arg)
     volatile VALUE tmp = rb_check_array_type(arg);
 
     if (!NIL_P(tmp)) {
-	return rb_str_format(RARRAY_LENINT(tmp), RARRAY_RAWPTR(tmp), str);
+	return rb_str_format(RARRAY_LENINT(tmp), RARRAY_CONST_PTR(tmp), str);
     }
     return rb_str_format(1, &arg, str);
 }