diff --git a/pkgs/applications/networking/mailreaders/thunderbird/default.nix b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
index 8e28190fea4c..00c6b5cbf27a 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/default.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/default.nix
@@ -335,7 +335,7 @@ stdenv.mkDerivation rec {
     attrPath = "thunderbird-78";
     baseUrl = "http://archive.mozilla.org/pub/thunderbird/releases/";
     inherit writeScript lib common-updater-scripts xidel coreutils gnused
-      gnugrep curl runtimeShell;
+      gnugrep gnupg curl runtimeShell;
   };
 
   requiredSystemFeatures = [ "big-parallel" ];