diff --git a/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c b/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
index c09512813fb..81b1df06e9c 100644
--- a/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
+++ b/arch/arm/src/lpc17xx_40xx/lpc17_40_adc.c
@@ -213,10 +213,13 @@ 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
   regval  = getreg32(LPC17_40_SYSCON_PCLKSEL0);
   regval &= ~SYSCON_PCLKSEL0_ADC_MASK;
   regval |= (SYSCON_PCLKSEL_CCLK8 << SYSCON_PCLKSEL0_ADC_SHIFT);
   putreg32(regval, LPC17_40_SYSCON_PCLKSEL0);
+#endif
 
 #ifdef CONFIG_LPC17_40_ADC_BURSTMODE
   clkdiv   = LPC17_40_CCLK / 3 / 65 / priv->sps;