diff --git a/trunk/src/app/srs_app_hls.cpp b/trunk/src/app/srs_app_hls.cpp
index f2ec18985..773ff7eb3 100644
--- a/trunk/src/app/srs_app_hls.cpp
+++ b/trunk/src/app/srs_app_hls.cpp
@@ -409,7 +409,7 @@ srs_error_t SrsHlsMuxer::restore_stream()
     }
     fr.close();
 
-    std::string body = fbuf;
+    std::string body(fbuf, nb_fbuf);
 
     // parse
     if (body.empty()) {