diff --git a/src/agent.rs b/src/agent.rs
index 1a76dcfc..6dcfa33e 100644
--- a/src/agent.rs
+++ b/src/agent.rs
@@ -1,4 +1,4 @@
-use std::fmt;
+use std::{env, fmt};
 use std::ops::Deref;
 use std::sync::Arc;
 use std::time::Duration;
@@ -249,9 +249,17 @@ const DEFAULT_MAX_IDLE_CONNECTIONS_PER_HOST: usize = 1;
 
 impl AgentBuilder {
     pub fn new() -> Self {
+        let names = ["http_proxy", "HTTP_PROXY", "https_proxy", "HTTPS_PROXY",
+            "socks_proxy", "SOCKS_PROXY", "socks5_proxy", "SOCKS5_PROXY"];
+        let proxy = names.iter().find_map(|&name| {
+            env::var(name).ok()
+        }).map(|addr| {
+            println!("Using proxy: {}", addr);
+            Proxy::new(addr).ok()
+        }).flatten();
         AgentBuilder {
             config: AgentConfig {
-                proxy: None,
+                proxy,
                 timeout_connect: Some(Duration::from_secs(30)),
                 timeout_read: None,
                 timeout_write: None,