diff --git a/pkgs/tools/X11/xpra/default.nix b/pkgs/tools/X11/xpra/default.nix
index 643e4664f71..69ea0c47893 100644
--- a/pkgs/tools/X11/xpra/default.nix
+++ b/pkgs/tools/X11/xpra/default.nix
@@ -29,7 +29,7 @@ buildPythonApplication rec {
   ];
 
   propagatedBuildInputs = with pythonPackages; [
-    pillow pygtk pygobject
+    pillow pygtk pygobject rencode
   ];
 
   preBuild = ''