diff --git a/osm2pgsql.nix b/osm2pgsql.nix
index 6ef9bd9..fc30b3a 100644
--- a/osm2pgsql.nix
+++ b/osm2pgsql.nix
@@ -17,6 +17,7 @@ stdenv.mkDerivation rec {
       expat
       geos
       lua
+      python    # regression tests
       postgresql
       proj
       zlib