diff --git a/src/security/validator.hpp b/src/security/validator.hpp
index b95c5ad..e9bf37e 100644
--- a/src/security/validator.hpp
+++ b/src/security/validator.hpp
@@ -248,6 +248,9 @@
            const OnInterestValidationFailed& onValidationFailed,
            int nSteps);
 
+  static shared_ptr<SignatureWithPublicKey>
+  determineSignatureWithPublicKey(const Signature& signature);
+
   /// Hooks
 
   /**