diff --git a/port/threadx/inc/tx_port.h b/port/threadx/inc/tx_port.h
index 2da25c8..3bd9927 100644
--- a/port/threadx/inc/tx_port.h
+++ b/port/threadx/inc/tx_port.h
@@ -93,7 +93,7 @@ typedef char CHAR;
 typedef unsigned char UCHAR;
 typedef int INT;
 typedef unsigned int UINT;
-typedef int LONG;
+typedef long LONG;
 typedef unsigned long ULONG;
 typedef unsigned long long ULONG64;
 typedef short SHORT;