diff --git a/src/org_pEp_jniadapter_AbstractEngine.cc b/src/org_pEp_jniadapter_AbstractEngine.cc
index b0962ac..2bc3bc7 100644
--- a/src/org_pEp_jniadapter_AbstractEngine.cc
+++ b/src/org_pEp_jniadapter_AbstractEngine.cc
@@ -315,7 +315,7 @@ extern "C" {
         notifyHandShakeMethodID = sync_env->GetMethodID(
             clazz,
             "notifyHandshakeCallFromC",
-            "(Lorg/pEp/jniadapter/_Identity;Lorg/pEp/jniadapter/_Identity;)I");
+            "(Lorg/pEp/jniadapter/_Identity;Lorg/pEp/jniadapter/_Identity;Lorg/pEp/jniadapter/SyncHandshakeSignal;)I");
         assert(notifyHandShakeMethodID);
 
         messageToSendMethodID = sync_env->GetMethodID(