diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index a624d27c2af..f260ce90cb5 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -103,6 +103,7 @@ in
 
   libXext = attrs: attrs // {
     buildInputs = attrs.buildInputs ++ [xorg.libXau];
+    propagatedBuildInputs = [ xorg.xproto ];
     preConfigure = setMalloc0ReturnsNullCrossCompiling;
   };