diff --git a/src/FreeRTOS/portmacro_cmsis.h b/src/FreeRTOS/portmacro_cmsis.h
index 3d2dee5c..0497538f 100644
--- a/src/FreeRTOS/portmacro_cmsis.h
+++ b/src/FreeRTOS/portmacro_cmsis.h
@@ -106,8 +106,8 @@ extern void vPortEnterCritical( void );
 extern void vPortExitCritical( void );
 #define portSET_INTERRUPT_MASK_FROM_ISR()       ulPortRaiseBASEPRI()
 #define portCLEAR_INTERRUPT_MASK_FROM_ISR(x)    vPortSetBASEPRI(x)
-#define portDISABLE_INTERRUPTS()                vPortRaiseBASEPRI()
-#define portENABLE_INTERRUPTS()                 vPortSetBASEPRI(0)
+#define portDISABLE_INTERRUPTS()                __asm volatile 	( " cpsid i " ::: "memory" )
+#define portENABLE_INTERRUPTS()                 __asm volatile 	( " cpsie i " ::: "memory" )
 #define portENTER_CRITICAL()                    vPortEnterCritical()
 #define portEXIT_CRITICAL()                     vPortExitCritical()