diff --git a/Makefile.PL b/Makefile.PL
index 371a4b14..1b1f1614 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -6,7 +6,14 @@ use ExtUtils::MakeMaker;
 WriteMakefile(
     NAME           => 'qpsmtpd',
     VERSION_FROM   => 'lib/Qpsmtpd.pm',
-    PREREQ_PM      => { },
+    PREREQ_PM      => {
+        'Mail::Header' => 0,
+        'MIME::Base64' => 0,
+        'Net::DNS'     => 0.39,
+        'Data::Dumper' => 0,
+        'File::Temp'   => 0,
+        'Time::HiRes'  => 0,
+    },
     ABSTRACT_FROM  => 'README',
     AUTHOR         => 'Ask Bjorn Hansen <ask@develooper.com>',
     EXE_FILES      => [qw(qpsmtpd qpsmtpd-forkserver)],