diff --git a/src/security/signature-sha256-with-rsa.cpp b/src/security/signature-sha256-with-rsa.cpp
index bc4fe65..3c84b54 100644
--- a/src/security/signature-sha256-with-rsa.cpp
+++ b/src/security/signature-sha256-with-rsa.cpp
@@ -39,4 +39,10 @@
   }
 }
 
+void
+SignatureSha256WithRsa::unsetKeyLocator()
+{
+  throw Error("KeyLocator cannot be reset for SignatureSha256WithRsa");
+}
+
 } // namespace ndn