diff --git a/components/esp_hw_support/test_apps/rtc_clk/main/test_rtc_clk.c b/components/esp_hw_support/test_apps/rtc_clk/main/test_rtc_clk.c
index 79cf26a98fa..71700dccd9b 100644
--- a/components/esp_hw_support/test_apps/rtc_clk/main/test_rtc_clk.c
+++ b/components/esp_hw_support/test_apps/rtc_clk/main/test_rtc_clk.c
@@ -263,6 +263,7 @@ static void start_freq(soc_rtc_slow_clk_src_t required_src, uint32_t start_delay
             printf("PASS");
         }
         printf(" [calibration val = %"PRIu32"] \n", esp_clk_slowclk_cal_get());
+        rtc_clk_slow_src_set(SOC_RTC_SLOW_CLK_SRC_DEFAULT);
         stop_rtc_external_quartz();
         esp_rom_delay_us(500000);
     }
@@ -304,6 +305,7 @@ TEST_CASE("Test starting external RTC quartz", "[rtc_clk][test_env=xtal32k]")
         } else {
             printf("PASS\n");
         }
+        rtc_clk_slow_src_set(SOC_RTC_SLOW_CLK_SRC_DEFAULT);
         stop_rtc_external_quartz();
         esp_rom_delay_us(100000);
     }