diff --git a/libraries/AP_HAL_Linux/Scheduler.cpp b/libraries/AP_HAL_Linux/Scheduler.cpp
index 16a2135d46..2643e64c11 100644
--- a/libraries/AP_HAL_Linux/Scheduler.cpp
+++ b/libraries/AP_HAL_Linux/Scheduler.cpp
@@ -309,12 +309,12 @@ void Scheduler::_run_io(void)
 void Scheduler::_run_uarts()
 {
     // process any pending serial bytes
-    UARTDriver::from(hal.uartA)->_timer_tick();
-    UARTDriver::from(hal.uartB)->_timer_tick();
-    UARTDriver::from(hal.uartC)->_timer_tick();
-    UARTDriver::from(hal.uartD)->_timer_tick();
-    UARTDriver::from(hal.uartE)->_timer_tick();
-    UARTDriver::from(hal.uartF)->_timer_tick();
+    hal.uartA->_timer_tick();
+    hal.uartB->_timer_tick();
+    hal.uartC->_timer_tick();
+    hal.uartD->_timer_tick();
+    hal.uartE->_timer_tick();
+    hal.uartF->_timer_tick();
 }
 
 void Scheduler::_rcin_task()
diff --git a/libraries/AP_HAL_Linux/UARTDriver.h b/libraries/AP_HAL_Linux/UARTDriver.h
index 493e495b2a..66c0072183 100644
--- a/libraries/AP_HAL_Linux/UARTDriver.h
+++ b/libraries/AP_HAL_Linux/UARTDriver.h
@@ -37,7 +37,7 @@ public:
     void set_device_path(const char *path);
 
     bool _write_pending_bytes(void);
-    virtual void _timer_tick(void);
+    virtual void _timer_tick(void) override;
 
     virtual enum flow_control get_flow_control(void) override
     {