diff --git a/arch/arm/src/at32/at32_adc.c b/arch/arm/src/at32/at32_adc.c
index 59efce00a21..e032787db72 100644
--- a/arch/arm/src/at32/at32_adc.c
+++ b/arch/arm/src/at32/at32_adc.c
@@ -2458,6 +2458,7 @@ static int adc_setup(struct adc_dev_s *dev)
 
   if (priv->initialized > 0)
     {
+      priv->initialized += 1;
       return OK;
     }