diff --git a/cranelift/bforest/src/map.rs b/cranelift/bforest/src/map.rs
index fb7d4d9ddf..7d7e456623 100644
--- a/cranelift/bforest/src/map.rs
+++ b/cranelift/bforest/src/map.rs
@@ -6,7 +6,7 @@ use crate::packed_option::PackedOption;
 use core::fmt;
 use core::marker::PhantomData;
 #[cfg(test)]
-use std::string::String;
+use alloc::string::String;
 
 /// Tag type defining forest types for a map.
 struct MapTypes<K, V>(PhantomData<(K, V)>);