diff --git a/reactos/dll/win32/atl100/atl.c b/reactos/dll/win32/atl100/atl.c
index bbc0193e997..1dbda7f423f 100644
--- a/reactos/dll/win32/atl100/atl.c
+++ b/reactos/dll/win32/atl100/atl.c
@@ -17,24 +17,9 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#define WIN32_NO_STATUS
-#define _INC_WINDOWS
-#define COM_NO_WINDOWS_H
+#include "precomp.h"
 
-#define COBJMACROS
-
-#include <stdarg.h>
-#include <windef.h>
-#include <winbase.h>
-#include <winreg.h>
 #include <wingdi.h>
-#include <objbase.h>
-#include <oleauto.h>
-
-#include <wine/atlbase.h>
-#include <wine/unicode.h>
-
-#include <wine/debug.h>
 
 WINE_DEFAULT_DEBUG_CHANNEL(atl100);
 
diff --git a/reactos/dll/win32/atl100/atl_ax.c b/reactos/dll/win32/atl100/atl_ax.c
index 43e21828e2b..91b16cd2661 100644
--- a/reactos/dll/win32/atl100/atl_ax.c
+++ b/reactos/dll/win32/atl100/atl_ax.c
@@ -18,30 +18,12 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#define WIN32_NO_STATUS
-#define _INC_WINDOWS
-#define COM_NO_WINDOWS_H
+#include "precomp.h"
 
-#include <stdarg.h>
-//#include <stdio.h>
-
-#define COBJMACROS
-
-#include <windef.h>
-#include <winbase.h>
-//#include "winerror.h"
-//#include "winuser.h"
-#include <wine/debug.h>
-//#include "objbase.h"
-//#include "objidl.h"
 #include <ole2.h>
 #include <exdisp.h>
-#include <atlbase.h>
-//#include "atliface.h"
 #include <atlwin.h>
 
-#include <wine/unicode.h>
-
 WINE_DEFAULT_DEBUG_CHANNEL(atl);
 
 typedef struct IOCS {
diff --git a/reactos/dll/win32/atl100/precomp.h b/reactos/dll/win32/atl100/precomp.h
new file mode 100644
index 00000000000..458366efba3
--- /dev/null
+++ b/reactos/dll/win32/atl100/precomp.h
@@ -0,0 +1,22 @@
+#ifndef _ATL100_PCH_
+#define _ATL100_PCH_
+
+#include <stdarg.h>
+
+#define WIN32_NO_STATUS
+#define _INC_WINDOWS
+#define COM_NO_WINDOWS_H
+
+#define COBJMACROS
+
+#include <windef.h>
+#include <winbase.h>
+#include <winreg.h>
+#include <objbase.h>
+#include <oleauto.h>
+
+#include <wine/atlbase.h>
+#include <wine/debug.h>
+#include <wine/unicode.h>
+
+#endif /* _ATL100_PCH_ */
diff --git a/reactos/dll/win32/atl100/registrar.c b/reactos/dll/win32/atl100/registrar.c
index a8d95352cf6..9da293f44a8 100644
--- a/reactos/dll/win32/atl100/registrar.c
+++ b/reactos/dll/win32/atl100/registrar.c
@@ -16,22 +16,7 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#define WIN32_NO_STATUS
-#define _INC_WINDOWS
-#define COM_NO_WINDOWS_H
-
-#define COBJMACROS
-
-#include <stdarg.h>
-#include <windef.h>
-#include <winbase.h>
-#include <winreg.h>
-#include <objbase.h>
-
-#include <atlbase.h>
-
-#include <wine/debug.h>
-#include <wine/unicode.h>
+#include "precomp.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(atl);