diff --git a/Build.PL b/Build.PL
index 03859b000..6634232a1 100644
--- a/Build.PL
+++ b/Build.PL
@@ -15,6 +15,7 @@ my $build = Module::Build->new(
         'Math::Geometry::Voronoi'   => '1.3',
         'Math::PlanePath'           => '53',
         'Moo'                       => '0',
+        'perl'                      => '5.10.0',
         'Time::HiRes'               => '0',
         'XXX'                       => '0',
     },