diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
index 6c2a42e3a24..cdd954e1975 100644
--- a/pkgs/tools/networking/mu/default.nix
+++ b/pkgs/tools/networking/mu/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
 
     # We install msg2pdf to bin/msg2pdf, fix its location in elisp
     substituteInPlace mu4e/mu4e-actions.el \
-      --replace "/toys/msg2pdf/msg2pdf" "/bin/msg2pdf"
+      --replace "/toys/msg2pdf/" "/bin/"
   '';
 
   # Install mug and msg2pdf