diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index 784976d06eaf..631f72672ea4 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -99,6 +99,7 @@ python.pkgs.buildPythonApplication rec {
     "celery"
     "css-inline"
     "cssutils"
+    "django-compressor"
     "django-csp"
     "django-filter"
     "django-hierarkey"