diff --git a/pkgs/development/python-modules/caldav/default.nix b/pkgs/development/python-modules/caldav/default.nix
index e67344270abe..c53eb0e20bce 100644
--- a/pkgs/development/python-modules/caldav/default.nix
+++ b/pkgs/development/python-modules/caldav/default.nix
@@ -32,12 +32,12 @@ buildPythonPackage rec {
     requests
     icalendar
     recurring-ical-events
+    pytz
+    tzlocal
   ];
 
   nativeCheckInputs = [
     pytestCheckHook
-    tzlocal
-    pytz
   ];
 
   # xandikos and radicale are only optional test dependencies, not available for python3