diff --git a/src/ncp/ncp_base.hpp b/src/ncp/ncp_base.hpp
index aa93c23bf..7cee5a16e 100644
--- a/src/ncp/ncp_base.hpp
+++ b/src/ncp/ncp_base.hpp
@@ -304,9 +304,6 @@ protected:
     void        HandleJoinerCallback(otError aError);
 #endif
 
-    static void SendDoneTask(void *aContext);
-    void        SendDoneTask(void);
-
     otError EncodeOperationalDataset(const otOperationalDataset &aDataset);
 
     otError DecodeOperationalDataset(otOperationalDataset &aDataset,