diff --git a/arch/arm/src/efm32/efm32_clockconfig.c b/arch/arm/src/efm32/efm32_clockconfig.c
index bd38e5c23e..91c006ec08 100644
--- a/arch/arm/src/efm32/efm32_clockconfig.c
+++ b/arch/arm/src/efm32/efm32_clockconfig.c
@@ -746,6 +746,7 @@ static inline uint32_t efm32_lfbclk_config(uint32_t lfbclksel, bool ulfrco,
           case CMU_LFCLKSEL_LFB_LFRCO:
             {
               efm32_enable_lfrco();
+              lfbclk = 0;
             }
             break;