diff --git a/src/Shell/ShellCMD.h b/src/Shell/ShellCMD.h
index 8017639c..eef6b653 100644
--- a/src/Shell/ShellCMD.h
+++ b/src/Shell/ShellCMD.h
@@ -2,6 +2,9 @@
 // Created by xzl on 2017/12/1.
 //
 
+#ifndef SRC_SHELL_SHELLCMD_H_
+#define SRC_SHELL_SHELLCMD_H_
+
 #include "Util/CMD.h"
 #include "Common/MediaSource.h"
 using namespace toolkit;
@@ -88,7 +91,6 @@ public:
     }
 };
 
+} /* namespace mediakit */
 
-
-
-} /* namespace mediakit */
\ No newline at end of file
+#endif //SRC_SHELL_SHELLCMD_H_
\ No newline at end of file