diff --git a/include/OneClient.h b/include/OneClient.h
index 4b09bae289..97e9ec6d4f 100644
--- a/include/OneClient.h
+++ b/include/OneClient.h
@@ -18,6 +18,7 @@
 #ifndef ONECLIENT_H_
 #define ONECLIENT_H_
 
+#ifdef __cplusplus
 #include <xmlrpc-c/base.hpp>
 #include <xmlrpc-c/client_simple.hpp>
 
@@ -286,8 +287,9 @@ private:
 
 extern "C"
 {
+#endif
 
-	void c_oneStart();
+	void c_oneStart(void);
 
 	int c_oneDeploy(int vmid, int hid);
 
@@ -313,7 +315,9 @@ extern "C"
 
 	int c_oneVmInfo(int vmid, char* ret_info,int leng);
 
-	void c_oneFree();
+	void c_oneFree(void);
+	
+#ifdef __cplusplus
 }
-
+#endif
 #endif /*ONECLIENT_H_*/