diff --git a/arch/arm/src/stm32/stm32_adc.c b/arch/arm/src/stm32/stm32_adc.c
index 2f7398eef2d..ca39b6a1d2a 100644
--- a/arch/arm/src/stm32/stm32_adc.c
+++ b/arch/arm/src/stm32/stm32_adc.c
@@ -2886,6 +2886,7 @@ static int adc_setup(struct adc_dev_s *dev)
 
   if (priv->initialized > 0)
     {
+      priv->initialized += 1;
       return OK;
     }
 
diff --git a/arch/arm/src/stm32f7/stm32_adc.c b/arch/arm/src/stm32f7/stm32_adc.c
index 1f918d21a3c..f78610ab63c 100644
--- a/arch/arm/src/stm32f7/stm32_adc.c
+++ b/arch/arm/src/stm32f7/stm32_adc.c
@@ -1798,6 +1798,7 @@ static int adc_setup(struct adc_dev_s *dev)
 
   if (priv->initialized > 0)
     {
+      priv->initialized += 1;
       return OK;
     }