diff --git a/src/libcore/hash/mod.rs b/src/libcore/hash/mod.rs
index 15545a04b64..ab714645675 100644
--- a/src/libcore/hash/mod.rs
+++ b/src/libcore/hash/mod.rs
@@ -99,9 +99,10 @@ use mem;
 #[allow(deprecated)]
 pub use self::sip::SipHasher;
 
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[allow(deprecated)]
-pub use self::sip::{SipHasher13, SipHasher24};
+#[doc(hidden)]
+pub use self::sip::SipHasher13;
 
 mod sip;
 
diff --git a/src/libcore/hash/sip.rs b/src/libcore/hash/sip.rs
index 4e4d9b3f1e2..e3bdecdc4b1 100644
--- a/src/libcore/hash/sip.rs
+++ b/src/libcore/hash/sip.rs
@@ -23,10 +23,11 @@ use mem;
 /// (eg. `collections::HashMap` uses it by default).
 ///
 /// See: <https://131002.net/siphash>
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[rustc_deprecated(since = "1.13.0",
                    reason = "use `std::collections::hash_map::DefaultHasher` instead")]
 #[derive(Debug, Clone, Default)]
+#[doc(hidden)]
 pub struct SipHasher13 {
     hasher: Hasher<Sip13Rounds>,
 }
@@ -34,11 +35,11 @@ pub struct SipHasher13 {
 /// An implementation of SipHash 2-4.
 ///
 /// See: <https://131002.net/siphash/>
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 #[rustc_deprecated(since = "1.13.0",
                    reason = "use `std::collections::hash_map::DefaultHasher` instead")]
 #[derive(Debug, Clone, Default)]
-pub struct SipHasher24 {
+struct SipHasher24 {
     hasher: Hasher<Sip24Rounds>,
 }
 
@@ -156,14 +157,16 @@ impl SipHasher {
     #[rustc_deprecated(since = "1.13.0",
                        reason = "use `std::collections::hash_map::DefaultHasher` instead")]
     pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher {
-        SipHasher(SipHasher24::new_with_keys(key0, key1))
+        SipHasher(SipHasher24 {
+            hasher: Hasher::new_with_keys(key0, key1)
+        })
     }
 }
 
 impl SipHasher13 {
     /// Creates a new `SipHasher13` with the two initial keys set to 0.
     #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
+    #[unstable(feature = "hashmap_internals", issue = "0")]
     #[rustc_deprecated(since = "1.13.0",
                        reason = "use `std::collections::hash_map::DefaultHasher` instead")]
     pub fn new() -> SipHasher13 {
@@ -172,7 +175,7 @@ impl SipHasher13 {
 
     /// Creates a `SipHasher13` that is keyed off the provided keys.
     #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
+    #[unstable(feature = "hashmap_internals", issue = "0")]
     #[rustc_deprecated(since = "1.13.0",
                        reason = "use `std::collections::hash_map::DefaultHasher` instead")]
     pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher13 {
@@ -182,28 +185,6 @@ impl SipHasher13 {
     }
 }
 
-impl SipHasher24 {
-    /// Creates a new `SipHasher24` with the two initial keys set to 0.
-    #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
-    #[rustc_deprecated(since = "1.13.0",
-                       reason = "use `std::collections::hash_map::DefaultHasher` instead")]
-    pub fn new() -> SipHasher24 {
-        SipHasher24::new_with_keys(0, 0)
-    }
-
-    /// Creates a `SipHasher24` that is keyed off the provided keys.
-    #[inline]
-    #[unstable(feature = "sip_hash_13", issue = "34767")]
-    #[rustc_deprecated(since = "1.13.0",
-                       reason = "use `std::collections::hash_map::DefaultHasher` instead")]
-    pub fn new_with_keys(key0: u64, key1: u64) -> SipHasher24 {
-        SipHasher24 {
-            hasher: Hasher::new_with_keys(key0, key1)
-        }
-    }
-}
-
 impl<S: Sip> Hasher<S> {
     #[inline]
     fn new_with_keys(key0: u64, key1: u64) -> Hasher<S> {
@@ -271,16 +252,16 @@ impl<S: Sip> Hasher<S> {
 impl super::Hasher for SipHasher {
     #[inline]
     fn write(&mut self, msg: &[u8]) {
-        self.0.write(msg)
+        self.0.hasher.write(msg)
     }
 
     #[inline]
     fn finish(&self) -> u64 {
-        self.0.finish()
+        self.0.hasher.finish()
     }
 }
 
-#[unstable(feature = "sip_hash_13", issue = "34767")]
+#[unstable(feature = "hashmap_internals", issue = "0")]
 impl super::Hasher for SipHasher13 {
     #[inline]
     fn write(&mut self, msg: &[u8]) {
@@ -293,19 +274,6 @@ impl super::Hasher for SipHasher13 {
     }
 }
 
-#[unstable(feature = "sip_hash_13", issue = "34767")]
-impl super::Hasher for SipHasher24 {
-    #[inline]
-    fn write(&mut self, msg: &[u8]) {
-        self.hasher.write(msg)
-    }
-
-    #[inline]
-    fn finish(&self) -> u64 {
-        self.hasher.finish()
-    }
-}
-
 impl<S: Sip> super::Hasher for Hasher<S> {
     // see short_write comment for explanation
     #[inline]
diff --git a/src/libcore/tests/hash/sip.rs b/src/libcore/tests/hash/sip.rs
index c6dd41798f2..bad858011e9 100644
--- a/src/libcore/tests/hash/sip.rs
+++ b/src/libcore/tests/hash/sip.rs
@@ -11,7 +11,7 @@
 #![allow(deprecated)]
 
 use core::hash::{Hash, Hasher};
-use core::hash::{SipHasher, SipHasher13, SipHasher24};
+use core::hash::{SipHasher, SipHasher13};
 use core::{slice, mem};
 
 // Hash just the bytes of the slice, without length prefix
@@ -224,14 +224,14 @@ fn test_siphash_2_4() {
     let k1 = 0x_0f_0e_0d_0c_0b_0a_09_08;
     let mut buf = Vec::new();
     let mut t = 0;
-    let mut state_inc = SipHasher24::new_with_keys(k0, k1);
+    let mut state_inc = SipHasher::new_with_keys(k0, k1);
 
     while t < 64 {
         let vec = u8to64_le!(vecs[t], 0);
-        let out = hash_with(SipHasher24::new_with_keys(k0, k1), &Bytes(&buf));
+        let out = hash_with(SipHasher::new_with_keys(k0, k1), &Bytes(&buf));
         assert_eq!(vec, out);
 
-        let full = hash_with(SipHasher24::new_with_keys(k0, k1), &Bytes(&buf));
+        let full = hash_with(SipHasher::new_with_keys(k0, k1), &Bytes(&buf));
         let i = state_inc.finish();
 
         assert_eq!(full, i);
@@ -322,13 +322,13 @@ fn test_hash_no_concat_alias() {
 #[test]
 fn test_write_short_works() {
     let test_usize = 0xd0c0b0a0usize;
-    let mut h1 = SipHasher24::new();
+    let mut h1 = SipHasher::new();
     h1.write_usize(test_usize);
     h1.write(b"bytes");
     h1.write(b"string");
     h1.write_u8(0xFFu8);
     h1.write_u8(0x01u8);
-    let mut h2 = SipHasher24::new();
+    let mut h2 = SipHasher::new();
     h2.write(unsafe {
         slice::from_raw_parts(&test_usize as *const _ as *const u8,
                               mem::size_of::<usize>())
diff --git a/src/libcore/tests/lib.rs b/src/libcore/tests/lib.rs
index e53964b5769..1c876fa0bd7 100644
--- a/src/libcore/tests/lib.rs
+++ b/src/libcore/tests/lib.rs
@@ -21,6 +21,7 @@
 #![feature(fixed_size_array)]
 #![feature(flt2dec)]
 #![feature(fmt_internals)]
+#![feature(hashmap_internals)]
 #![feature(iterator_step_by)]
 #![feature(i128_type)]
 #![cfg_attr(stage0, feature(inclusive_range_syntax))]
@@ -35,7 +36,6 @@
 #![feature(range_is_empty)]
 #![feature(raw)]
 #![feature(refcell_replace_swap)]
-#![feature(sip_hash_13)]
 #![feature(slice_patterns)]
 #![feature(sort_internals)]
 #![feature(specialization)]
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 70a1f82c9a1..62bef4bc499 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -267,7 +267,7 @@
 #![feature(fn_traits)]
 #![feature(fnbox)]
 #![feature(generic_param_attrs)]
-#![feature(hashmap_hasher)]
+#![feature(hashmap_internals)]
 #![feature(heap_api)]
 #![feature(i128)]
 #![feature(i128_type)]
@@ -298,7 +298,6 @@
 #![feature(raw)]
 #![feature(rustc_attrs)]
 #![feature(stdsimd)]
-#![feature(sip_hash_13)]
 #![feature(slice_bytes)]
 #![feature(slice_concat_ext)]
 #![feature(slice_internals)]