diff --git a/arch/arm/src/stm32/stm32_i2c_v2.c b/arch/arm/src/stm32/stm32_i2c_v2.c
index 22073d9f6f..e17b537849 100644
--- a/arch/arm/src/stm32/stm32_i2c_v2.c
+++ b/arch/arm/src/stm32/stm32_i2c_v2.c
@@ -2804,6 +2804,7 @@ int stm32_i2cbus_uninitialize(struct i2c_master_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(dev);
       return OK;
     }
 
diff --git a/arch/arm/src/stm32f0l0g0/stm32_i2c.c b/arch/arm/src/stm32f0l0g0/stm32_i2c.c
index 362cf0de5d..4f34ed1c99 100644
--- a/arch/arm/src/stm32f0l0g0/stm32_i2c.c
+++ b/arch/arm/src/stm32f0l0g0/stm32_i2c.c
@@ -2803,6 +2803,7 @@ int stm32_i2cbus_uninitialize(struct i2c_master_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(dev);
       return OK;
     }
 
diff --git a/arch/arm/src/stm32f7/stm32_i2c.c b/arch/arm/src/stm32f7/stm32_i2c.c
index cce760ec80..6a629f6da8 100644
--- a/arch/arm/src/stm32f7/stm32_i2c.c
+++ b/arch/arm/src/stm32f7/stm32_i2c.c
@@ -2842,6 +2842,7 @@ int stm32_i2cbus_uninitialize(struct i2c_master_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(dev);
       return OK;
     }
 
diff --git a/arch/arm/src/stm32h7/stm32_i2c.c b/arch/arm/src/stm32h7/stm32_i2c.c
index 5d2edf9148..87736a2a4a 100644
--- a/arch/arm/src/stm32h7/stm32_i2c.c
+++ b/arch/arm/src/stm32h7/stm32_i2c.c
@@ -2805,6 +2805,7 @@ int stm32_i2cbus_uninitialize(struct i2c_master_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(dev);
       return OK;
     }
 
diff --git a/arch/arm/src/stm32l4/stm32l4_1wire.c b/arch/arm/src/stm32l4/stm32l4_1wire.c
index 0078ee3e6b..593eb86478 100644
--- a/arch/arm/src/stm32l4/stm32l4_1wire.c
+++ b/arch/arm/src/stm32l4/stm32l4_1wire.c
@@ -1247,6 +1247,7 @@ int stm32l4_1wireuninitialize(struct onewire_dev_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(priv);
       return OK;
     }
 
diff --git a/arch/arm/src/stm32l4/stm32l4_i2c.c b/arch/arm/src/stm32l4/stm32l4_i2c.c
index 216fe28da1..7a2ed68dc0 100644
--- a/arch/arm/src/stm32l4/stm32l4_i2c.c
+++ b/arch/arm/src/stm32l4/stm32l4_i2c.c
@@ -3007,6 +3007,7 @@ int stm32l4_i2cbus_uninitialize(struct i2c_master_s *dev)
   if (--priv->refs)
     {
       nxmutex_unlock(&priv->lock);
+      kmm_free(dev);
       return OK;
     }