diff --git a/libraries/AP_HAL_Linux/RCInput_UDP.cpp b/libraries/AP_HAL_Linux/RCInput_UDP.cpp
index e573660e90..80c958db80 100644
--- a/libraries/AP_HAL_Linux/RCInput_UDP.cpp
+++ b/libraries/AP_HAL_Linux/RCInput_UDP.cpp
@@ -39,7 +39,7 @@ void LinuxRCInput_UDP::_timer_tick(void)
         }
         if (_last_buf_ts != 0 &&
             (delay = _buf.timestamp_us - _last_buf_ts) > 100000) {
-            hal.console->printf("no rc cmds received for %llu\n", delay);
+            hal.console->printf("no rc cmds received for %llu\n", (unsigned long long)delay);
         }
         _last_buf_ts = _buf.timestamp_us;