diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index 372d86d44415..7098f3975c29 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -95,6 +95,7 @@ python.pkgs.buildPythonApplication rec {
     "django-csp"
     "django-filter"
     "django-formset-js-improved"
+    "django-formtools"
     "django-i18nfield"
     "djangorestframework"
     "markdown"