diff --git a/libraries/AP_LeakDetector/AP_LeakDetector_Analog.h b/libraries/AP_LeakDetector/AP_LeakDetector_Analog.h
index cd51639e4a..6af4679fdf 100644
--- a/libraries/AP_LeakDetector/AP_LeakDetector_Analog.h
+++ b/libraries/AP_LeakDetector/AP_LeakDetector_Analog.h
@@ -6,7 +6,7 @@
 class AP_LeakDetector_Analog : public AP_LeakDetector_Backend {
 public:
     AP_LeakDetector_Analog(AP_LeakDetector &_leak_detector, AP_LeakDetector::LeakDetector_State &_state);
-    void read(void);
+    void read(void) override;
 
 private:
     AP_HAL::AnalogSource *source;
diff --git a/libraries/AP_LeakDetector/AP_LeakDetector_Digital.h b/libraries/AP_LeakDetector/AP_LeakDetector_Digital.h
index d9721be921..299b7543d1 100644
--- a/libraries/AP_LeakDetector/AP_LeakDetector_Digital.h
+++ b/libraries/AP_LeakDetector/AP_LeakDetector_Digital.h
@@ -5,5 +5,5 @@
 class AP_LeakDetector_Digital : public AP_LeakDetector_Backend {
 public:
     AP_LeakDetector_Digital(AP_LeakDetector &_leak_detector, AP_LeakDetector::LeakDetector_State &_state);
-    void read(void);
+    void read(void) override;
 };