diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index bea6f3cc41c4..faf0d0912aee 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -86,6 +86,7 @@ python.pkgs.buildPythonApplication rec {
 
   pythonRelaxDeps = [
     "django-csp"
+    "django-filter"
     "python-dateutil"
   ];