diff --git a/pkgs/servers/radicale/default.nix b/pkgs/servers/radicale/default.nix
index 6752e5b80b7..937bf327995 100644
--- a/pkgs/servers/radicale/default.nix
+++ b/pkgs/servers/radicale/default.nix
@@ -21,6 +21,7 @@ python3Packages.buildPythonApplication {
   propagatedBuildInputs = with python3Packages; [
     vobject
     passlib
+    pytz
   ];
 
   meta = with stdenv.lib; {