diff --git a/src/lib.rs b/src/lib.rs
index 17b01027..9c1212ba 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -29,7 +29,9 @@ mod raw;
 mod string;
 mod vec;
 
+#[cfg(feature="std")]
 use std::any::Any;
+#[cfg(feature="std")]
 use std::error::Error;
 use std::fmt;