diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC54114/TARGET_LPCXpresso/mbed_overrides.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC54114/TARGET_LPCXpresso/mbed_overrides.c
index 3d49a8cca5..037b2515bf 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC54114/TARGET_LPCXpresso/mbed_overrides.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC54114/TARGET_LPCXpresso/mbed_overrides.c
@@ -41,7 +41,6 @@ void ADC_ClockPower_Configuration(void)
     POWER_DisablePD(kPDRUNCFG_PD_TEMPS);    /* Power on the temperature sensor. */
 
     /* Enable the clock. */
-    CLOCK_AttachClk(kFRO12M_to_MAIN_CLK);
     CLOCK_EnableClock(kCLOCK_Adc0);
 }
 
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_FF_LPC546XX/mbed_overrides.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_FF_LPC546XX/mbed_overrides.c
index a17af3a634..e5418bf47f 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_FF_LPC546XX/mbed_overrides.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_FF_LPC546XX/mbed_overrides.c
@@ -73,8 +73,6 @@ void ADC_ClockPower_Configuration(void)
     POWER_DisablePD(kPDRUNCFG_PD_VREFP);   /* Power on the reference voltage source. */
     POWER_DisablePD(kPDRUNCFG_PD_TS);      /* Power on the temperature sensor. */
 
-    /* Enable the clock. */
-    CLOCK_AttachClk(kFRO12M_to_MAIN_CLK);
 
     /* CLOCK_AttachClk(kMAIN_CLK_to_ADC_CLK); */
     /* Sync clock source is not used. Using sync clock source and would be divided by 2.
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_LPCXpresso/mbed_overrides.c b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_LPCXpresso/mbed_overrides.c
index ccce4750c5..0d95d0345e 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_LPCXpresso/mbed_overrides.c
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC546XX/TARGET_LPCXpresso/mbed_overrides.c
@@ -121,8 +121,6 @@ void ADC_ClockPower_Configuration(void)
     POWER_DisablePD(kPDRUNCFG_PD_VREFP);   /* Power on the reference voltage source. */
     POWER_DisablePD(kPDRUNCFG_PD_TS);      /* Power on the temperature sensor. */
 
-    /* Enable the clock. */
-    CLOCK_AttachClk(kFRO12M_to_MAIN_CLK);
 
     /* CLOCK_AttachClk(kMAIN_CLK_to_ADC_CLK); */
     /* Sync clock source is not used. Using sync clock source and would be divided by 2.