diff --git a/packages/patched-derivations.nix b/packages/patched-derivations.nix
index b3c877b..2ef672f 100644
--- a/packages/patched-derivations.nix
+++ b/packages/patched-derivations.nix
@@ -48,6 +48,7 @@ super: rec {
 
   s3ql = (patch super.s3ql "patches/base/s3ql").overrideAttrs (old: {
     propagatedBuildInputs = old.propagatedBuildInputs ++ [
+      super.python3Packages.packaging
       super.python3Packages.systemd
     ];
   });