diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index 0f799ed29581..027b0bd60961 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -105,6 +105,7 @@ python.pkgs.buildPythonApplication rec {
     "celery"
     "css_inline"
     "cssutils"
+    "defusedcsv"
     "defusedxml"
     "django-compressor"
     "django-csp"