diff --git a/libraries/AP_HAL_Empty/UARTDriver.cpp b/libraries/AP_HAL_Empty/UARTDriver.cpp
index 22effd0b1d..ab12fca5ee 100644
--- a/libraries/AP_HAL_Empty/UARTDriver.cpp
+++ b/libraries/AP_HAL_Empty/UARTDriver.cpp
@@ -1,5 +1,6 @@
 
 #include "UARTDriver.h"
+#include <AP_Common/ExpandingString.h>
 
 Empty::UARTDriver::UARTDriver() {}
 
@@ -28,3 +29,8 @@ size_t Empty::UARTDriver::write(const uint8_t *buffer, size_t size)
     }
     return n;
 }
+
+void Empty::UARTDriver::uart_info(ExpandingString &str)
+{
+    str.printf("EMPTY\n");
+}
diff --git a/libraries/AP_HAL_Empty/UARTDriver.h b/libraries/AP_HAL_Empty/UARTDriver.h
index e4ad9a4bd0..65515bd3ff 100644
--- a/libraries/AP_HAL_Empty/UARTDriver.h
+++ b/libraries/AP_HAL_Empty/UARTDriver.h
@@ -23,4 +23,7 @@ public:
     /* Empty implementations of Print virtual methods */
     size_t write(uint8_t c) override;
     size_t write(const uint8_t *buffer, size_t size) override;
+
+    // request information on uart I/O for one uart
+    void uart_info(ExpandingString &str) override;
 };