diff --git a/pkgs/tools/networking/shadowsocks-libev/default.nix b/pkgs/tools/networking/shadowsocks-libev/default.nix
index 6b4c684834a..74ae4f808a9 100644
--- a/pkgs/tools/networking/shadowsocks-libev/default.nix
+++ b/pkgs/tools/networking/shadowsocks-libev/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ zlib asciidoc xmlto docbook_xml_dtd_45 docbook_xsl libxslt ]
                 ++ optional (!withMbedTLS) openssl
                 ++ optional withMbedTLS mbedtls
-                ++ optional enableSystemSharedLib [libev libsodium udns];
+                ++ optionals enableSystemSharedLib [libev libsodium udns];
 
   configureFlags = optional withMbedTLS
                      [ "--with-crypto-library=mbedtls"