diff --git a/pkgs/development/perl-modules/DB_File/default.nix b/pkgs/development/perl-modules/DB_File/default.nix
index 2a344e392fe..adf66a44806 100644
--- a/pkgs/development/perl-modules/DB_File/default.nix
+++ b/pkgs/development/perl-modules/DB_File/default.nix
@@ -1,11 +1,11 @@
 {fetchurl, buildPerlPackage, db4}:
 
 buildPerlPackage {
-  name = "DB_File-1.816";
+  name = "DB_File-1.820";
   
   src = fetchurl {
-    url = mirror://cpan/authors/id/P/PM/PMQS/DB_File-1.816.tar.gz;
-    sha256 = "1a668hk5v0l180kbqss2hq9khl756cmrykn8fz1rl4qzsp6lq284";
+    url = mirror://cpan/authors/id/P/PM/PMQS/DB_File-1.820.tar.gz;
+    sha256 = "0jnz5lsrad67j42sdw5bqpkmgiyj45rpiqgkff3i21252k9d5s7a";
   };
 
   preConfigure = ''
@@ -16,4 +16,12 @@ buildPerlPackage {
     INCLUDE = ${db4}/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 = ''
+    ensureDir $out/lib/perl5/site_perl/
+    cp -R $out/lib/perl5/5* $out/lib/perl5/site_perl
+  '';
 }