diff --git a/aos/linux_code/logging/log_displayer.cc b/aos/linux_code/logging/log_displayer.cc
index cbf4891..dd78b91 100644
--- a/aos/linux_code/logging/log_displayer.cc
+++ b/aos/linux_code/logging/log_displayer.cc
@@ -146,7 +146,8 @@
 
   int fd = open(filename, O_RDONLY);
   if (fd == -1) {
-    fprintf(stderr, "error: couldn't open file '%s' for reading because of %s\n",
+    fprintf(stderr,
+            "error: couldn't open file '%s' for reading because of %s\n",
             filename, strerror(errno));
     exit(EXIT_FAILURE);
   }