diff --git a/pkgs/by-name/pr/pretix/package.nix b/pkgs/by-name/pr/pretix/package.nix
index f4582f124a83..cb6a67f343f2 100644
--- a/pkgs/by-name/pr/pretix/package.nix
+++ b/pkgs/by-name/pr/pretix/package.nix
@@ -92,6 +92,7 @@ python.pkgs.buildPythonApplication rec {
 
   pythonRelaxDeps = [
     "beautifulsoup4"
+    "celery"
     "django-bootstrap3"
     "django-phonenumber-field"
     "dnspython"