1 files changed, 2 insertions, 2 deletions
diff --git a/string.c b/string.c
index 3449ce6b53..48718f93ac 100644
--- a/string.c
+++ b/string.c
@@ -2006,8 +2006,8 @@ rb_str_format_m(VALUE str, VALUE arg)
     VALUE tmp = rb_check_array_type(arg);
 
     if (!NIL_P(tmp)) {
-        VALUE rv = rb_str_format(RARRAY_LENINT(tmp), RARRAY_CONST_PTR(tmp), str);
-        RB_GC_GUARD(tmp);
+        const long len = RARRAY_LENINT(tmp);
+        VALUE rv = rb_str_format(len, RARRAY_CONST_PTR(tmp), str);
         return rv;
     }
     return rb_str_format(1, &arg, str);