diff --git a/src/server/repo.v b/src/server/repo.v
index 051a7c25..8f8270d5 100644
--- a/src/server/repo.v
+++ b/src/server/repo.v
@@ -68,7 +68,7 @@ fn (mut app App) put_package(repo_ string) web.Result {
 		mut sw := time.new_stopwatch(time.StopWatchOptions{ auto_start: true })
 
 		util.reader_to_file(mut app.reader, length.int(), pkg_path) or {
-			app.lwarn("Failed to upload '${pkg_path}'")
+			app.lwarn("Failed to upload '${pkg_path}': ${err.msg()}")
 
 			return app.status(.internal_server_error)
 		}
diff --git a/src/util/stream.v b/src/util/stream.v
index 4b362fc9..ef6e872b 100644
--- a/src/util/stream.v
+++ b/src/util/stream.v
@@ -46,6 +46,10 @@ pub fn reader_to_file(mut reader io.BufferedReader, length int, path string) ! {
 			to_write = to_write - bytes_written
 		}
 	}
+
+	if bytes_left > 0 {
+		return error('Not all bytes were received.')
+	}
 }
 
 // match_array_in_array[T] returns how many elements of a2 overlap with a1. For