diff --git a/components/bootloader_support/src/bootloader_random.c b/components/bootloader_support/src/bootloader_random.c
index b58ebe941d..5a00d0cf5a 100644
--- a/components/bootloader_support/src/bootloader_random.c
+++ b/components/bootloader_support/src/bootloader_random.c
@@ -135,4 +135,8 @@ void bootloader_random_disable(void)
     /* Reset i2s peripheral */
     SET_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_I2S0_RST);
     CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_I2S0_RST);
+
+    /* Disable pull supply voltage to SAR ADC */
+    CLEAR_PERI_REG_MASK(RTC_CNTL_TEST_MUX_REG, RTC_CNTL_ENT_RTC);
+    SET_PERI_REG_BITS(RTC_CNTL_TEST_MUX_REG, RTC_CNTL_DTEST_RTC, 0, RTC_CNTL_DTEST_RTC_S);
 }