diff --git a/cpu/efm32/include/periph_cpu.h b/cpu/efm32/include/periph_cpu.h
index 8df5ecada2..f574feb178 100644
--- a/cpu/efm32/include/periph_cpu.h
+++ b/cpu/efm32/include/periph_cpu.h
@@ -455,6 +455,15 @@ typedef struct {
  */
 #define PM_NUM_MODES    (3U)
 
+/**
+ * @name   Available power modes
+ * @{
+ */
+#define EFM32_PM_MODE_EM3  (0U)  /**< CPU sleeps, peripherals in EM3 domain are active */
+#define EFM32_PM_MODE_EM2  (1U)  /**< CPU sleeps, peripherals in EM2 + EM3 domain are active */
+#define EFM32_PM_MODE_EM1  (2U)  /**< CPU sleeps, all peripherals are active */
+/** @} */
+
 /**
  * @name    Watchdog timer (WDT) configuration
  * @{
diff --git a/cpu/efm32/periph/pm.c b/cpu/efm32/periph/pm.c
index 4a9aaef707..122d4e93a7 100644
--- a/cpu/efm32/periph/pm.c
+++ b/cpu/efm32/periph/pm.c
@@ -25,14 +25,15 @@
 void pm_set(unsigned mode)
 {
     switch (mode) {
-        case 0:
+        case EFM32_PM_MODE_EM3:
             /* after exiting EM3, clocks are restored */
             EMU_EnterEM3(true);
             break;
-        case 1:
+        case EFM32_PM_MODE_EM2:
             /* after exiting EM2, clocks are restored */
             EMU_EnterEM2(true);
             break;
+        case EFM32_PM_MODE_EM1:
         default:
             /* wait for next event or interrupt */
             EMU_EnterEM1();