diff --git a/dll/shellext/ntobjshex/ntobjenum.h b/dll/shellext/ntobjshex/ntobjenum.h
index 51937df1b57..253c483c12e 100644
--- a/dll/shellext/ntobjshex/ntobjenum.h
+++ b/dll/shellext/ntobjshex/ntobjenum.h
@@ -15,12 +15,8 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
+#pragma once
 
-extern "C" {
-#define NTOS_MODE_USER
-#include <ndk/ntndk.h>
-#include <ndk/rtlfuncs.h>
-}
 
 // All the possible values are defined here because I want the type field to be
 // "persistable" and not change if more types are added in the future.
diff --git a/dll/shellext/ntobjshex/precomp.h b/dll/shellext/ntobjshex/precomp.h
index 55a055723e2..d221a8c671b 100644
--- a/dll/shellext/ntobjshex/precomp.h
+++ b/dll/shellext/ntobjshex/precomp.h
@@ -10,6 +10,12 @@
 #define COM_NO_WINDOWS_H
 #define NTOS_MODE_USER
 
+extern "C"
+{
+#include <ndk/ntndk.h>
+#include <ndk/rtlfuncs.h>
+}
+
 #include <windef.h>
 #include <winbase.h>
 #include <winreg.h>