diff --git a/pkgs/applications/networking/dropbox/default.nix b/pkgs/applications/networking/dropbox/default.nix
index 158f41abe2079..b2dbd5ac13d2c 100644
--- a/pkgs/applications/networking/dropbox/default.nix
+++ b/pkgs/applications/networking/dropbox/default.nix
@@ -42,7 +42,7 @@ buildFHSEnv {
   unsharePid = false;
 
   targetPkgs = pkgs: with pkgs; with xorg; [
-    libICE libSM libX11 libXcomposite libXdamage libXext libXfixes libXrender
+    libICE libSM libX11 libXcomposite libXdamage libXext libXfixes libXrender libXmu
     libXxf86vm libGL libxcb xkeyboardconfig
     curl dbus firefox-bin fontconfig freetype gcc glib gnutar libxml2 libxslt
     procps zlib mesa libxshmfence libpthreadstubs libappindicator