diff --git a/services/hilogd/log_persister.cpp b/services/hilogd/log_persister.cpp
index fba0d0197371bdfd1239421284fd0dcfb4f2bde7..d656e06a0885e12f0cd97843faad45a6a8d55fbd 100644
--- a/services/hilogd/log_persister.cpp
+++ b/services/hilogd/log_persister.cpp
@@ -188,7 +188,7 @@ void LogPersister::SetBufferOffset(int off)
 
 int GenPersistLogHeader(HilogData *data, list<string>& persistList)
 {
-    char buffer[MAX_LOG_LEN];
+    char buffer[MAX_LOG_LEN * 2];
     HilogShowFormatBuffer showBuffer;
     showBuffer.level = data->level;
     showBuffer.pid = data->pid;