diff --git a/pkgs/development/python-modules/dnspython/default.nix b/pkgs/development/python-modules/dnspython/default.nix
index 5c359635ba5ab..c3a365bb275d7 100644
--- a/pkgs/development/python-modules/dnspython/default.nix
+++ b/pkgs/development/python-modules/dnspython/default.nix
@@ -62,6 +62,7 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [
     pytestCheckHook
+    cacert
   ];
 
   checkInputs = [