diff --git a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_core_cm.h b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_core_cm.h
index 25d00fd8f1e..f0b4dc19d8b 100644
--- a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_core_cm.h
+++ b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_core_cm.h
@@ -33,8 +33,8 @@
 
 #include <stdbool.h>
 typedef bool bool_t;
-#define FALSE                   ((bool_t)0)
-#define TRUE                    ((bool_t)1)
+#define FALSE                   (0)
+#define TRUE                    (1)
 
 #ifdef  RTE_CMSIS_RTOS2_RTX5_ARMV8M_NS
 #define DOMAIN_NS               1