diff --git a/tools/common/dump_mp4.cpp b/tools/common/dump_mp4.cpp
index 3f81aae..bfc541c 100644
--- a/tools/common/dump_mp4.cpp
+++ b/tools/common/dump_mp4.cpp
@@ -37,7 +37,9 @@ extern "C" {
 }
 
 #undef av_err2str
-#define av_err2str(errnum) av_make_error_string((char*)__builtin_alloca(AV_ERROR_MAX_STRING_SIZE), AV_ERROR_MAX_STRING_SIZE, errnum)
+#define av_err2str(errnum)                                                 \
+  av_make_error_string((char *)__builtin_alloca(AV_ERROR_MAX_STRING_SIZE), \
+                       AV_ERROR_MAX_STRING_SIZE, errnum)
 
 #define STREAM_DURATION 10.0
 #define STREAM_FRAME_RATE 25 /* 25 images/s */