diff --git a/examples/system/ulp/README.md b/examples/system/ulp/README.md
index 17ba58f21e..4b2c5341a1 100644
--- a/examples/system/ulp/README.md
+++ b/examples/system/ulp/README.md
@@ -14,8 +14,6 @@ In this example the input signal is connected to GPIO0. Note that this pin was c
 
 ## Example output
 
-Note: GPIO15 is connected to GND to disable ROM bootloader output.
-
 ```
 Not ULP wakeup, initializing ULP
 Entering deep sleep
diff --git a/examples/system/ulp/main/ulp_example_main.c b/examples/system/ulp/main/ulp_example_main.c
index 74c4febe40..a6e76bacb7 100644
--- a/examples/system/ulp/main/ulp_example_main.c
+++ b/examples/system/ulp/main/ulp_example_main.c
@@ -75,11 +75,11 @@ static void init_ulp_program()
 
     /* Disconnect GPIO12 and GPIO15 to remove current drain through
      * pullup/pulldown resistors.
-     * GPIO15 may be connected to ground to suppress boot messages.
      * GPIO12 may be pulled high to select flash voltage.
      */
     rtc_gpio_isolate(GPIO_NUM_12);
     rtc_gpio_isolate(GPIO_NUM_15);
+    esp_deep_sleep_disable_rom_logging(); // suppress boot messages
 
     /* Set ULP wake up period to T = 20ms.
      * Minimum pulse width has to be T * (ulp_debounce_counter + 1) = 80ms.
diff --git a/examples/system/ulp_adc/main/ulp_adc_example_main.c b/examples/system/ulp_adc/main/ulp_adc_example_main.c
index fd7d4ef438..80f9fc1ebf 100644
--- a/examples/system/ulp_adc/main/ulp_adc_example_main.c
+++ b/examples/system/ulp_adc/main/ulp_adc_example_main.c
@@ -76,11 +76,11 @@ static void init_ulp_program()
 
     /* Disconnect GPIO12 and GPIO15 to remove current drain through
      * pullup/pulldown resistors.
-     * GPIO15 may be connected to ground to suppress boot messages.
      * GPIO12 may be pulled high to select flash voltage.
      */
     rtc_gpio_isolate(GPIO_NUM_12);
     rtc_gpio_isolate(GPIO_NUM_15);
+    esp_deep_sleep_disable_rom_logging(); // suppress boot messages
 }
 
 static void start_ulp_program()