diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index 63e5c47..3c04d92 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -295,7 +295,7 @@ pre_install(){
     char=`get_char`
     #Install necessary dependencies
     yum install -y epel-release && yum makecache
-    yum install -y unzip openssl openssl-devel gettext gcc autoconf libtool automake make asciidoc xmlto udns-devel libev-devel
+    yum install -y unzip openssl openssl-devel gettext gcc autoconf libtool automake make asciidoc xmlto udns-devel libev-devel pcre pcre-devel
 }
 
 download() {