diff --git a/arch/arm/src/stm32/stm32_adc.c b/arch/arm/src/stm32/stm32_adc.c
index b9f615fc7d3..4dffd6637bf 100644
--- a/arch/arm/src/stm32/stm32_adc.c
+++ b/arch/arm/src/stm32/stm32_adc.c
@@ -2886,8 +2886,6 @@ static int adc_setup(FAR struct adc_dev_s *dev)
       return OK;
     }
 
-  priv->initialized += 1;
-
   /* Attach the ADC interrupt */
 
 #ifndef CONFIG_STM32_ADC_NOIRQ
@@ -2960,6 +2958,10 @@ static int adc_setup(FAR struct adc_dev_s *dev)
   adccmn_lock(priv, false);
 #endif
 
+  /* The ADC device is ready */
+
+  priv->initialized += 1;
+
   return ret;
 }