diff --git a/pkgs/desktops/kde-5/plasma-5.6/plasma-desktop/default.nix b/pkgs/desktops/kde-5/plasma-5.6/plasma-desktop/default.nix
index 58c2325f5c4..e3d9176b816 100644
--- a/pkgs/desktops/kde-5/plasma-5.6/plasma-desktop/default.nix
+++ b/pkgs/desktops/kde-5/plasma-5.6/plasma-desktop/default.nix
@@ -34,7 +34,7 @@ plasmaPackage rec {
     })
     ./0003-tzdir.patch
   ];
-  NIX_CFLAGS_COMPILE = [ "-I${xorgserver}/include/xorg" ];
+  NIX_CFLAGS_COMPILE = [ "-I${xorgserver.dev}/include/xorg" ];
   cmakeFlags = [
     "-DEvdev_INCLUDE_DIRS=${xf86inputevdev}/include/xorg"
     "-DSynaptics_INCLUDE_DIRS=${xf86inputsynaptics}/include/xorg"
diff --git a/pkgs/os-specific/linux/xf86-input-multitouch/default.nix b/pkgs/os-specific/linux/xf86-input-multitouch/default.nix
index 7abf6d7c828..38b85a098c1 100644
--- a/pkgs/os-specific/linux/xf86-input-multitouch/default.nix
+++ b/pkgs/os-specific/linux/xf86-input-multitouch/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation {
   buildInputs = [ mtdev xproto xextproto inputproto libpciaccess randrproto ];
 
   buildPhase = ''
-    make INCLUDE="$NIX_CFLAGS_COMPILE -I${xorgserver}/include/xorg -I${pixman}/include/pixman-1 -Iinclude"
+    make INCLUDE="$NIX_CFLAGS_COMPILE -I${xorgserver.dev}/include/xorg -I${pixman}/include/pixman-1 -Iinclude"
   '';
 
   installPhase = ''