diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index 1dbf8c25..0364f78d 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -1415,7 +1415,8 @@ struct chrono_format_checker : null_chrono_spec_handler<chrono_format_checker> {
   FMT_CONSTEXPR void on_minute(numeric_system) {}
   FMT_CONSTEXPR void on_second(numeric_system) {}
   FMT_CONSTEXPR void on_second_with_fractions(numeric_system, int precision) {
-    check_allowed_precision(precision, {3, 6, 9, 12, 15, 18});
+    static constexpr int allowed_precisions[6] = {3, 6, 9, 12, 15, 18};
+    check_allowed_precision(precision, allowed_precisions);
   }
   FMT_CONSTEXPR void on_12_hour_time() {}
   FMT_CONSTEXPR void on_24_hour_time() {}