diff --git a/drivers/clock_control/clock_control_mcux_sim.c b/drivers/clock_control/clock_control_mcux_sim.c
index ff371a78556..a9f58d2b75b 100644
--- a/drivers/clock_control/clock_control_mcux_sim.c
+++ b/drivers/clock_control/clock_control_mcux_sim.c
@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <soc.h>
 #include <clock_control.h>
+#include <dt-bindings/clock/kinetis_sim.h>
 #include <fsl_clock.h>
 
 #define SYS_LOG_LEVEL CONFIG_SYS_LOG_CLOCK_CONTROL_LEVEL
@@ -25,7 +26,16 @@ static int mcux_sim_get_subsys_rate(struct device *dev,
 				    clock_control_subsys_t sub_system,
 				    u32_t *rate)
 {
-	clock_name_t clock_name = (clock_name_t) sub_system;
+	clock_name_t clock_name;
+
+	switch ((u32_t) sub_system) {
+	case KINETIS_SIM_LPO_CLK:
+		clock_name = kCLOCK_LpoClk;
+		break;
+	default:
+		clock_name = (clock_name_t) sub_system;
+		break;
+	}
 
 	*rate = CLOCK_GetFreq(clock_name);
 
diff --git a/include/dt-bindings/clock/kinetis_sim.h b/include/dt-bindings/clock/kinetis_sim.h
index 32b09c2d8ee..25edaf3b09c 100644
--- a/include/dt-bindings/clock/kinetis_sim.h
+++ b/include/dt-bindings/clock/kinetis_sim.h
@@ -10,5 +10,6 @@
 #define KINETIS_SIM_CORESYS_CLK		0
 #define KINETIS_SIM_PLATFORM_CLK	1
 #define KINETIS_SIM_BUS_CLK		2
+#define KINETIS_SIM_LPO_CLK		19
 
 #endif /* __KINETIS_SIM_H */