diff --git a/apps/px4/px4io/driver/uploader.cpp b/apps/px4/px4io/driver/uploader.cpp
index 7d6a9e1714..0fbbac839d 100644
--- a/apps/px4/px4io/driver/uploader.cpp
+++ b/apps/px4/px4io/driver/uploader.cpp
@@ -318,7 +318,7 @@ PX4IO_Uploader::verify()
 
 			ret = recv(c);
 			if (ret != OK) {
-				log("%d: got %d waiting for bytes", ret);
+				log("%d: got %d waiting for bytes", base + i, ret);
 				return ret;
 			}