diff --git a/portable/GCC/ARM_CM3/port.c b/portable/GCC/ARM_CM3/port.c
index a5cea1e1e1..c60336738b 100644
--- a/portable/GCC/ARM_CM3/port.c
+++ b/portable/GCC/ARM_CM3/port.c
@@ -737,7 +737,7 @@ __attribute__( ( weak ) ) void vPortSetupTimerInterrupt( void )
              * The following links provide detailed information:
              * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html
              * https://www.FreeRTOS.org/FAQHelp.html */
-            configASSERT( ucCurrentPriority >= ucMaxSysCallPriority );
+            configASSERT( ucCurrentPriority >= ulMaxSysCallPriority );
         }
 
         /* Priority grouping:  The interrupt controller (NVIC) allows the bits