diff --git a/src/fn_args.rs b/src/fn_args.rs
index 9f83e67e..10a4e022 100644
--- a/src/fn_args.rs
+++ b/src/fn_args.rs
@@ -5,6 +5,8 @@
 
 use crate::dynamic::Variant;
 use crate::{Dynamic, StaticVec};
+#[cfg(feature = "no_std")]
+use std::prelude::v1::*;
 
 /// Trait that parses arguments to a function call.
 ///