diff --git a/src/server/ltp_server.cpp b/src/server/ltp_server.cpp
index 843033d71..8ccab5676 100644
--- a/src/server/ltp_server.cpp
+++ b/src/server/ltp_server.cpp
@@ -457,7 +457,6 @@ static int Service(struct mg_connection *conn) {
       str_format = format;
     }
 
-    delete []sentence;
     DEBUG_LOG("Input sentence is: %s", strSentence.c_str());
 
     //Get a XML4NLP instance here.