diff --git a/pkgs/servers/rt/default.nix b/pkgs/servers/rt/default.nix
index 4d8ead30add..b4400215dd0 100644
--- a/pkgs/servers/rt/default.nix
+++ b/pkgs/servers/rt/default.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
       name = "rt-perl-deps";
       paths = (with perlPackages; [
         ApacheSession BusinessHours CGIEmulatePSGI CGIPSGI
-        CSSMinifierXP CSSSquish ConvertColor CryptEksblowfish
+        CSSMinifierXS CSSSquish ConvertColor CryptEksblowfish
         CryptSSLeay DBDSQLite DBDmysql DBIxSearchBuilder DataGUID
         DataICal DataPagePageset DateExtract DateManip
         DateTimeFormatNatural DevelGlobalDestruction EmailAddress
diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index e60b9b273fe..04007a1016e 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -3599,7 +3599,7 @@ let
     propagatedBuildInputs = [ Clone ];
   };
 
-  CSSMinifierXP = buildPerlModule {
+  CSSMinifierXS = buildPerlModule {
     pname = "CSS-Minifier-XS";
     version = "0.09";
     src = fetchurl {