diff --git a/pkgs/servers/sql/mysql55/default.nix b/pkgs/servers/sql/mysql55/default.nix
index 558c9925d113..81514494c078 100644
--- a/pkgs/servers/sql/mysql55/default.nix
+++ b/pkgs/servers/sql/mysql55/default.nix
@@ -15,9 +15,9 @@ stdenv.mkDerivation rec {
     sha256 = "13y7bhjmx4daidvyqjz88yffbswb6rc1khkmiqm896fx3lglkcpr";
   };
 
-  buildInputs = if stdenv.isDarwin
-    then [ cmake bison ncurses openssl readline zlib perl ]
-    else [ cmake bison ncurses openssl readline zlib ];
+  buildInputs = [ cmake bison ncurses openssl readline zlib ]
+     ++ stdenv.lib.optional stdenv.isDarwin perl;
+
 
   enableParallelBuilding = true;