diff --git a/libraries/AP_HAL/Util.h b/libraries/AP_HAL/Util.h
index 53e0d98768..a6ba4f7463 100644
--- a/libraries/AP_HAL/Util.h
+++ b/libraries/AP_HAL/Util.h
@@ -190,7 +190,8 @@ public:
 
     // log info on stack usage
     virtual void log_stack_info(void) {}
-    
+
+    virtual void last_crash_dump(ExpandingString &str) const {}
 protected:
     // we start soft_armed false, so that actuators don't send any
     // values until the vehicle code has fully started