diff --git a/arch/arm/src/stm32/stm32_adc.c b/arch/arm/src/stm32/stm32_adc.c
index 29b4aabddfb..777f624aa4d 100644
--- a/arch/arm/src/stm32/stm32_adc.c
+++ b/arch/arm/src/stm32/stm32_adc.c
@@ -964,7 +964,9 @@ static void adc_reset(FAR struct adc_dev_s *dev)
   uint32_t regval;
   int offset;
   int i;
+#ifdef ADC_HAVE_TIMER
   int ret;
+#endif
 
   avdbg("intf: ADC%d\n", priv->intf);
   flags = irqsave();
@@ -987,7 +989,6 @@ static void adc_reset(FAR struct adc_dev_s *dev)
 
   adc_putreg(priv, STM32_ADC_LTR_OFFSET, 0x00000000);
 
-
   /* Initialize the same sample time for each ADC 55.5 cycles
    *
    * During sample cycles channel selection bits must remain unchanged.