diff --git a/Cargo.toml b/Cargo.toml
index f0d92c6..2789d50 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,7 +11,7 @@ readme = "README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-slab = "0.4.7"
+slab = { version = "0.4.7", default-features = false }
 
 [dev-dependencies]
 proptest = "1"
diff --git a/src/lib.rs b/src/lib.rs
index cd9693f..a8cab80 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,7 +11,9 @@
 //! assert_eq!(q.poll(100), Some("second"));
 //! ```
 
-use std::fmt;
+#![no_std]
+
+use core::fmt;
 
 use slab::Slab;
 
@@ -477,7 +479,9 @@ pub struct Timer(usize);
 
 #[cfg(test)]
 mod tests {
-    use std::collections::HashMap;
+    extern crate std;
+
+    use std::{vec::Vec, collections::HashMap};
 
     use super::*;
     use proptest::prelude::*;