diff --git a/FreeRTOS/Source/portable/GCC/ARM_CRx_No_GIC/portmacro.h b/FreeRTOS/Source/portable/GCC/ARM_CRx_No_GIC/portmacro.h
index 45960e68f..9056b0d59 100644
--- a/FreeRTOS/Source/portable/GCC/ARM_CRx_No_GIC/portmacro.h
+++ b/FreeRTOS/Source/portable/GCC/ARM_CRx_No_GIC/portmacro.h
@@ -132,6 +132,12 @@ macros is used. */
 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )	void vFunction( void *pvParameters )
 #define portTASK_FUNCTION( vFunction, pvParameters )	void vFunction( void *pvParameters )
 
+/* Tickless idle/low power functionality. */
+#ifndef portSUPPRESS_TICKS_AND_SLEEP
+	extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
+	#define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime ) vPortSuppressTicksAndSleep( xExpectedIdleTime )
+#endif
+
 /* Prototype of the FreeRTOS tick handler.  This must be installed as the
 handler for whichever peripheral is used to generate the RTOS tick. */
 void FreeRTOS_Tick_Handler( void );