diff --git a/Source/portable/IAR/ARM_CM3/portasm.s b/Source/portable/IAR/ARM_CM3/portasm.s
index d4071e39c..d3329a30d 100644
--- a/Source/portable/IAR/ARM_CM3/portasm.s
+++ b/Source/portable/IAR/ARM_CM3/portasm.s
@@ -146,9 +146,14 @@ vPortSVCHandler;
 /*-----------------------------------------------------------*/
 
 vPortStartFirstTask
+	/* Use the NVIC offset register to locate the stack. */
+	ldr r0, =0xE000ED08
+	ldr r0, [r0]
+	ldr r0, [r0]
+	/* Set the msp back to the start of the stack. */
 	msr msp, r0
+	/* Call SVC to start the first task. */
 	svc 0
 
-
 	END
 	
\ No newline at end of file