diff --git a/.travis.yml b/.travis.yml
index 35313dba..3975954d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: rust
 script:
 - (cd phf && cargo test)
-- (cd phf && cargo test --features core)
 - (cd phf_macros && cargo test --features stats)
 - ./.travis/build_docs.sh
 after_success:
diff --git a/README.md b/README.md
index f5c0996f..2d391e04 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,6 @@ produced, but if you use the `phf_mac` crate with the `stats` feature enabled
 
 Documentation is available at https://sfackler.github.io/rust-phf/doc/phf
 
-The `phf/core` feature will compile the `phf` crate with a dependency on
-libcore instead of libstd, enabling use in environments where libstd will not
-work.
-
 Example
 =======
 
diff --git a/phf/Cargo.toml b/phf/Cargo.toml
index f7d0b3a4..d7c7c3d8 100644
--- a/phf/Cargo.toml
+++ b/phf/Cargo.toml
@@ -12,9 +12,6 @@ name = "phf"
 path = "src/lib.rs"
 test = false
 
-[features]
-core = ["phf_shared/core"]
-
 [dependencies.phf_shared]
 path = "../phf_shared"
 version = "=0.6.9"
diff --git a/phf/src/lib.rs b/phf/src/lib.rs
index 184f18e7..b7ebd4cc 100644
--- a/phf/src/lib.rs
+++ b/phf/src/lib.rs
@@ -36,14 +36,7 @@
 #![doc(html_root_url="https://sfackler.github.io/rust-phf/doc")]
 #![feature(core, no_std)]
 #![warn(missing_docs)]
-#![no_std]
 
-#[macro_use]
-#[cfg(feature = "core")]
-extern crate core;
-#[macro_use]
-#[cfg(not(feature = "core"))]
-extern crate std;
 extern crate phf_shared;
 
 pub use phf_shared::PhfHash;
@@ -60,16 +53,3 @@ pub mod map;
 pub mod set;
 pub mod ordered_map;
 pub mod ordered_set;
-
-#[cfg(feature = "core")]
-mod std {
-    pub use core::{borrow, fmt, iter, option, ops, slice};
-    pub mod prelude {
-        pub use core::prelude as v1;
-    }
-}
-
-#[cfg(not(feature = "core"))]
-mod core {
-    pub use std::{fmt, option, iter};
-}
diff --git a/phf/tests/test.rs b/phf/tests/test.rs
index 5f41b0e0..adba6bfb 100644
--- a/phf/tests/test.rs
+++ b/phf/tests/test.rs
@@ -338,13 +338,13 @@ mod ordered_map {
 
     #[test]
     fn test_entries() {
-        static MAP: phf::OrderedMap<&'static str, isize> = phf_ordered_map!(
+        static MAP: phf::OrderedMap<&'static str, i32> = phf_ordered_map!(
             "foo" => 10,
             "bar" => 11,
             "baz" => 12,
         );
         let vec = MAP.entries().map(|(&k, &v)| (k, v)).collect::<Vec<_>>();
-        assert_eq!(vec, vec!(("foo", 10is), ("bar", 11), ("baz", 12)));
+        assert_eq!(vec, vec!(("foo", 10), ("bar", 11), ("baz", 12)));
     }
 
     #[test]
@@ -360,13 +360,13 @@ mod ordered_map {
 
     #[test]
     fn test_values() {
-        static MAP: phf::OrderedMap<&'static str, isize> = phf_ordered_map!(
+        static MAP: phf::OrderedMap<&'static str, i32> = phf_ordered_map!(
             "foo" => 10,
             "bar" => 11,
             "baz" => 12,
         );
         let vec = MAP.values().map(|&v| v).collect::<Vec<_>>();
-        assert_eq!(vec, vec!(10is, 11, 12));
+        assert_eq!(vec, vec!(10, 11, 12));
     }
 
     #[test]
diff --git a/phf_shared/Cargo.toml b/phf_shared/Cargo.toml
index dedee7ae..d51eef15 100644
--- a/phf_shared/Cargo.toml
+++ b/phf_shared/Cargo.toml
@@ -10,7 +10,3 @@ repository = "https://github.com/sfackler/rust-phf"
 name = "phf_shared"
 path = "src/lib.rs"
 test = false
-
-[features]
-
-core = []
diff --git a/phf_shared/src/lib.rs b/phf_shared/src/lib.rs
index 357879ee..6ccabb12 100644
--- a/phf_shared/src/lib.rs
+++ b/phf_shared/src/lib.rs
@@ -1,19 +1,9 @@
 #![feature(hash)]
-#![cfg_attr(feature = "core", feature(no_std))]
-#![cfg_attr(feature = "core", no_std)]
 #![doc(html_root_url="http://sfackler.github.io/rust-phf/doc")]
 
-#[cfg(feature = "core")]
-extern crate core;
-
 use std::str::StrExt;
 use std::hash::{Hasher, Hash, SipHasher};
 
-#[cfg(feature = "core")]
-mod std {
-    pub use core::{slice, str, hash};
-}
-
 #[inline]
 pub fn displace(f1: u32, f2: u32, d1: u32, d2: u32) -> u32 {
     d2 + f1 * d1 + f2