diff --git a/flake.nix b/flake.nix
index 5cb4fa9..2bea10d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,7 +13,10 @@
         naersk-lib = pkgs.callPackage naersk { };
       in {
 
-        defaultPackage = naersk-lib.buildPackage ./.;
+        defaultPackage = naersk-lib.buildPackage {
+          src = ./.;
+          buildInputs = with pkgs; [ pkg-config openssl ];
+        };
 
         defaultApp = utils.lib.mkApp { drv = self.defaultPackage."${system}"; };