diff --git a/openssl-sys/build.rs b/openssl-sys/build.rs
index a5d3f2d1..a7b39e84 100644
--- a/openssl-sys/build.rs
+++ b/openssl-sys/build.rs
@@ -1,11 +1,11 @@
-#![feature(core, collections, os)]
+#![feature(core, collections, env)]
 
 extern crate "pkg-config" as pkg_config;
 
-use std::os;
+use std::env;
 
 fn main() {
-    let target = os::getenv("TARGET").unwrap();
+    let target = env::var_string("TARGET").unwrap();
     let is_android = target.find_str("android").is_some();
 
     // Without hackory, pkg-config will only look for host libraries.
@@ -32,9 +32,10 @@ fn main() {
         }
 
         if is_android {
-            let path = os::getenv("OPENSSL_PATH").expect("Android does not provide openssl libraries, please \
-                                                          build them yourselves (instructions in the README) \
-                                                          and provide their location through $OPENSSL_PATH.");
+            let path = env::var_string("OPENSSL_PATH").ok()
+                .expect("Android does not provide openssl libraries, please build them yourselves \
+                         (instructions in the README) and provide their location through \
+                         $OPENSSL_PATH.");
             flags.push_str(format!(" -L {}", path).as_slice());
         }
 
diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 84bd004b..fd16792b 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -1,6 +1,6 @@
 #![allow(non_camel_case_types, non_upper_case_globals, non_snake_case)]
 #![allow(dead_code)]
-#![feature(core, io, libc, os, path, std_misc)]
+#![feature(core, io, libc, path, std_misc, env)]
 
 extern crate libc;
 
diff --git a/openssl-sys/src/probe.rs b/openssl-sys/src/probe.rs
index 1615f73a..7896b3e9 100644
--- a/openssl-sys/src/probe.rs
+++ b/openssl-sys/src/probe.rs
@@ -1,4 +1,4 @@
-use std::os;
+use std::env;
 use std::old_io::fs::PathExtensions;
 
 pub struct ProbeResult {
@@ -41,17 +41,17 @@ pub fn init_ssl_cert_env_vars() {
 
     fn put(var: &str, path: Path) {
         // Don't stomp over what anyone else has set
-        match os::getenv(var) {
+        match env::var(var) {
             Some(..) => {}
-            None => os::setenv(var, path),
+            None => env::set_var(var, &path),
         }
     }
 }
 
 pub fn probe() -> ProbeResult {
     let mut result = ProbeResult {
-        cert_file: os::getenv("SSL_CERT_FILE").map(Path::new),
-        cert_dir: os::getenv("SSL_CERT_DIR").map(Path::new),
+        cert_file: env::var_string("SSL_CERT_FILE").ok().map(Path::new),
+        cert_dir: env::var_string("SSL_CERT_DIR").ok().map(Path::new),
     };
     for certs_dir in find_certs_dirs().iter() {
         // cert.pem looks to be an openssl 1.0.1 thing, while