diff --git a/src/base/array_storage.rs b/src/base/array_storage.rs
index ae7a2e3b..bbcf69c9 100644
--- a/src/base/array_storage.rs
+++ b/src/base/array_storage.rs
@@ -10,6 +10,8 @@ use serde::ser::SerializeSeq;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 #[cfg(feature = "serde-serialize-no-std")]
 use std::marker::PhantomData;
+#[cfg(feature = "serde-serialize-no-std")]
+use std::fmt::{self, Formatter};
 
 use crate::base::allocator::Allocator;
 use crate::base::default_allocator::DefaultAllocator;