diff --git a/pkgs/applications/misc/tilix/default.nix b/pkgs/applications/misc/tilix/default.nix
index 98e320b7aaf..eb7a8e41d4b 100644
--- a/pkgs/applications/misc/tilix/default.nix
+++ b/pkgs/applications/misc/tilix/default.nix
@@ -21,7 +21,6 @@ stdenv.mkDerivation rec {
 
   preBuild = ''
     makeFlagsArray=(
-      PERL5LIB="${perlPackages.Po4a}/lib/perl5"
       DCFLAGS='-O -inline -release -version=StdLoggerDisableTrace'
     )
   '';
diff --git a/pkgs/tools/package-management/apt/default.nix b/pkgs/tools/package-management/apt/default.nix
index b2d5e96f391..abd5e6f2f4f 100644
--- a/pkgs/tools/package-management/apt/default.nix
+++ b/pkgs/tools/package-management/apt/default.nix
@@ -35,8 +35,6 @@ stdenv.mkDerivation rec {
   ];
 
   preConfigure = ''
-    export PERL5LIB="$PERL5LIB''${PERL5LIB:+:}${Po4a}/lib/perl5";
-
     cmakeFlagsArray+=(
       -DBERKELEY_DB_INCLUDE_DIRS=${db.dev}/include
       -DDOCBOOK_XSL="${docbook_xsl}"/share/xml/docbook-xsl