diff --git a/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c b/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
index 81b1df06e9c..9c4bde71aa6 100644
--- a/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
+++ b/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
@@ -213,8 +213,9 @@ static void adc_reset(FAR struct adc_dev_s *dev)
 
   putreg32(ADC_CR_PDN, LPC17_40_ADC_CR);
 
-/* PCLKSEL0 only exists in LPC176x family parts */
 #ifdef LPC176x
+  /* PCLKSEL0 only exists in LPC176x family parts */
+
   regval  = getreg32(LPC17_40_SYSCON_PCLKSEL0);
   regval &= ~SYSCON_PCLKSEL0_ADC_MASK;
   regval |= (SYSCON_PCLKSEL_CCLK8 << SYSCON_PCLKSEL0_ADC_SHIFT);