diff --git a/src/crypto/hash.rs b/src/crypto/hash.rs
index 6c9f33e4..4a4031e2 100644
--- a/src/crypto/hash.rs
+++ b/src/crypto/hash.rs
@@ -96,7 +96,7 @@ impl Hasher {
     pub fn final(&self) -> Vec<u8> {
         unsafe {
             let mut res = Vec::from_elem(self.len, 0u8);
-            EVP_DigestFinal(self.ctx, res.as_mut_ptr(), ptr::mut_null());
+            EVP_DigestFinal(self.ctx, res.as_mut_ptr(), ptr::null_mut());
             res
         }
     }
diff --git a/src/crypto/pkey.rs b/src/crypto/pkey.rs
index 4eb9bf40..d4a98713 100644
--- a/src/crypto/pkey.rs
+++ b/src/crypto/pkey.rs
@@ -107,7 +107,7 @@ impl PKey {
 
     fn _fromstr(&mut self, s: &[u8], f: unsafe extern "C" fn(*const *mut RSA, *const *const u8, c_uint) -> *mut RSA) {
         unsafe {
-            let rsa = ptr::mut_null();
+            let rsa = ptr::null_mut();
             f(&rsa, &s.as_ptr(), s.len() as c_uint);
             EVP_PKEY_set1_RSA(self.evp, rsa);
         }
diff --git a/src/ssl/mod.rs b/src/ssl/mod.rs
index 85503704..2ae1d41a 100644
--- a/src/ssl/mod.rs
+++ b/src/ssl/mod.rs
@@ -132,7 +132,7 @@ impl SslContext {
         init();
 
         let ctx = unsafe { ffi::SSL_CTX_new(method.to_raw()) };
-        if ctx == ptr::mut_null() {
+        if ctx == ptr::null_mut() {
             return Err(SslError::get());
         }
 
@@ -296,18 +296,18 @@ impl Drop for Ssl {
 impl Ssl {
     pub fn new(ctx: &SslContext) -> Result<Ssl, SslError> {
         let ssl = unsafe { ffi::SSL_new(ctx.ctx) };
-        if ssl == ptr::mut_null() {
+        if ssl == ptr::null_mut() {
             return Err(SslError::get());
         }
         let ssl = Ssl { ssl: ssl };
 
         let rbio = unsafe { ffi::BIO_new(ffi::BIO_s_mem()) };
-        if rbio == ptr::mut_null() {
+        if rbio == ptr::null_mut() {
             return Err(SslError::get());
         }
 
         let wbio = unsafe { ffi::BIO_new(ffi::BIO_s_mem()) };
-        if wbio == ptr::mut_null() {
+        if wbio == ptr::null_mut() {
             unsafe { ffi::BIO_free_all(rbio) }
             return Err(SslError::get());
         }