diff --git a/src/Mayaqua/Kernel.c b/src/Mayaqua/Kernel.c
index d5f3ce6f..78d69a49 100644
--- a/src/Mayaqua/Kernel.c
+++ b/src/Mayaqua/Kernel.c
@@ -1903,7 +1903,7 @@ void UINT64ToSystem(SYSTEMTIME *st, UINT64 sec64)
 	sec = (UINT)tmp64;
 	time = (time_64t)sec;
 	TimeToSystem(st, time);
-	st->wMilliseconds = (WORD)millisec;
+	st->wMilliseconds = (USHORT)millisec;
 }
 
 // Convert the SYSTEMTIME to UINT64
diff --git a/src/Mayaqua/MayaType.h b/src/Mayaqua/MayaType.h
index 118bcb17..398cb336 100644
--- a/src/Mayaqua/MayaType.h
+++ b/src/Mayaqua/MayaType.h
@@ -185,7 +185,6 @@ typedef	signed int			INT;
 #endif
 
 // 16bit integer type
-typedef	unsigned short		WORD;
 typedef	unsigned short		USHORT;
 
 // 8bit integer type
@@ -287,14 +286,14 @@ typedef struct OS_INFO
 #ifndef	WINDOWS_H
 typedef struct SYSTEMTIME
 {
-	WORD wYear;
-	WORD wMonth;
-	WORD wDayOfWeek;
-	WORD wDay;
-	WORD wHour;
-	WORD wMinute;
-	WORD wSecond;
-	WORD wMilliseconds;
+	USHORT wYear;
+	USHORT wMonth;
+	USHORT wDayOfWeek;
+	USHORT wDay;
+	USHORT wHour;
+	USHORT wMinute;
+	USHORT wSecond;
+	USHORT wMilliseconds;
 } SYSTEMTIME;
 #endif	// WINDOWS_H