diff --git a/reactos/drivers/bus/acpi/include/platform/types.h b/reactos/drivers/bus/acpi/include/platform/types.h
index 48c828b57f6..48565bd3692 100644
--- a/reactos/drivers/bus/acpi/include/platform/types.h
+++ b/reactos/drivers/bus/acpi/include/platform/types.h
@@ -335,6 +335,10 @@ typedef char *LPSTR;
 
 typedef const unsigned short *LPCWSTR;
 
+typedef unsigned short RTL_ATOM;
+typedef unsigned short *PRTL_ATOM;
+typedef WORD ATOM;
+
 typedef struct _COORD {
   SHORT X;
   SHORT Y;