diff --git a/libraries/AP_HAL_QURT/Scheduler.cpp b/libraries/AP_HAL_QURT/Scheduler.cpp
index d66a66db78..5e790f7db0 100644
--- a/libraries/AP_HAL_QURT/Scheduler.cpp
+++ b/libraries/AP_HAL_QURT/Scheduler.cpp
@@ -261,7 +261,7 @@ void *Scheduler::_io_thread(void *arg)
     return nullptr;
 }
 
-bool Scheduler::in_main_thread()
+bool Scheduler::in_main_thread() const
 {
     return getpid() == _main_task_pid;
 }
diff --git a/libraries/AP_HAL_QURT/Scheduler.h b/libraries/AP_HAL_QURT/Scheduler.h
index 385e2a58f4..7613646937 100644
--- a/libraries/AP_HAL_QURT/Scheduler.h
+++ b/libraries/AP_HAL_QURT/Scheduler.h
@@ -31,7 +31,7 @@ public:
     void     resume_timer_procs();
     void     reboot(bool hold_in_bootloader);
 
-    bool     in_main_thread();
+    bool     in_main_thread() const override;
     void     system_initialized();
     void     hal_initialized();