diff --git a/README.md b/README.md
index a03c2c8..442de0f 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Install Shadowsocks.
 
 #### Debian / Ubuntu:
 
-    apt-get install build-essential python-pip python-m2crypto
+    apt-get install build-essential python-pip python-m2crypto python-dev
     pip install gevent shadowsocks
 
 #### CentOS: