diff --git a/src/security/signature-sha256-with-ecdsa.cpp b/src/security/signature-sha256-with-ecdsa.cpp
index 1f67425..91b4a29 100644
--- a/src/security/signature-sha256-with-ecdsa.cpp
+++ b/src/security/signature-sha256-with-ecdsa.cpp
@@ -39,4 +39,10 @@
   }
 }
 
+void
+SignatureSha256WithEcdsa::unsetKeyLocator()
+{
+  throw Error("KeyLocator cannot be reset for SignatureSha256WithEcdsa");
+}
+
 } // namespace ndn