diff --git a/arch/sim/Kconfig b/arch/sim/Kconfig
index dc3a85b549..e882670539 100644
--- a/arch/sim/Kconfig
+++ b/arch/sim/Kconfig
@@ -27,7 +27,7 @@ config SIM_WALLTIME
 		calls the system timer "interrupt handler" as fast as possible.  As a result, there
 		really are no noticeable delays when a task sleeps.  However, the task really does
 		sleep -- but the time scale is wrong.  If you want behavior that is closer to
-		normal timing, then you can define CONFIG_SIM_WALLTIME=y in your configuration
+		normal timing, then you can define SIM_WALLTIME=y in your configuration
 		file.  This configuration setting will cause the sim target's IDLE loop to delay
 		on each call so that the system "timer interrupt" is called at a rate approximately
 		correct for the system timer tick rate.  With this definition in the configuration,