diff --git a/reactos/drivers/dd/serial/serial.h b/reactos/drivers/dd/serial/serial.h
index 8ac8fa1397d..b998f0f8aa7 100644
--- a/reactos/drivers/dd/serial/serial.h
+++ b/reactos/drivers/dd/serial/serial.h
@@ -22,8 +22,6 @@
   #define DPRINT1 DbgPrint("(%s:%d) ", __FILE__, __LINE__), DbgPrint
   #define CHECKPOINT1 DbgPrint("(%s:%d)\n", __FILE__, __LINE__)
 
-  #define TAG(A, B, C, D) (ULONG)(((A)<<0) + ((B)<<8) + ((C)<<16) + ((D)<<24))
-
   NTSTATUS STDCALL
   IoAttachDeviceToDeviceStackSafe(
     IN PDEVICE_OBJECT SourceDevice,
@@ -42,6 +40,8 @@
   #error Unknown compiler!
 #endif
 
+#define TAG(A, B, C, D) (ULONG)(((A)<<0) + ((B)<<8) + ((C)<<16) + ((D)<<24))
+
 typedef enum
 {
   dsStopped,