diff --git a/osm2pgsql.nix b/osm2pgsql.nix
index fc30b3a..c729ad4 100644
--- a/osm2pgsql.nix
+++ b/osm2pgsql.nix
@@ -16,8 +16,9 @@ stdenv.mkDerivation rec {
       cmake
       expat
       geos
+      libressl    # TLS, crypto implementation
       lua
-      python    # regression tests
+      python      # regression tests
       postgresql
       proj
       zlib