diff --git a/pkgs/development/perl-modules/DB_File/default.nix b/pkgs/development/perl-modules/DB_File/default.nix
index 4195f8d613e7..7dd04463d18f 100644
--- a/pkgs/development/perl-modules/DB_File/default.nix
+++ b/pkgs/development/perl-modules/DB_File/default.nix
@@ -16,12 +16,4 @@ buildPerlPackage rec {
     INCLUDE = ${db}/include
     EOF
   '';
-
-  # I don't know about perl paths, but PERL5LIB env var is managed through
-  # lib/perl5/site_perl, and the *.pm should be inside lib/perl5/site_perl/...
-  # for other packages to get that in the PERL5LIB env var.
-  postInstall = ''
-    mkdir -p $out/lib/perl5/site_perl/
-    cp -R $out/lib/perl5/5* $out/lib/perl5/site_perl
-  '';
 }