diff --git a/libraries/AP_Logger/AP_Logger_MAVLink.cpp b/libraries/AP_Logger/AP_Logger_MAVLink.cpp
index 4856d61b66..61d06357c7 100644
--- a/libraries/AP_Logger/AP_Logger_MAVLink.cpp
+++ b/libraries/AP_Logger/AP_Logger_MAVLink.cpp
@@ -12,7 +12,7 @@
 
 #if REMOTE_LOG_DEBUGGING
 #include <stdio.h>
- # define Debug(fmt, args ...)  do {printf("%s:%d: " fmt "\n", __FUNCTION__, __LINE__, ## args); hal.scheduler->delay(1); } while(0)
+ # define Debug(fmt, args ...)  do {fprintf(stderr, "%s:%d: " fmt "\n", __FUNCTION__, __LINE__, ## args); hal.scheduler->delay(1); } while(0)
 #else
  # define Debug(fmt, args ...)
 #endif