diff --git a/packages/gpa/acss/acss.go b/packages/gpa/acss/acss.go
index dd0b6ae184..8b62e388ae 100644
--- a/packages/gpa/acss/acss.go
+++ b/packages/gpa/acss/acss.go
@@ -243,6 +243,10 @@ func (a *acssImpl) handleInput(secretToShare kyber.Scalar) gpa.OutMessages {
 		pubKeys = append(pubKeys, a.peerPKs[peerID])
 	}
 	deal := crypto.NewDeal(a.suite, pubKeys, secretToShare)
+	for i := range a.peerIdx {
+		// only used for testing
+		deal.Shares[i] = a.dealCB(i, deal.Shares[i])
+	}
 	data, err := deal.MarshalBinary()
 	if err != nil {
 		panic(fmt.Sprintf("acss: internal error: %v", err))
diff --git a/packages/gpa/test_context.go b/packages/gpa/test_context.go
index 592fa919d6..f18de677af 100644
--- a/packages/gpa/test_context.go
+++ b/packages/gpa/test_context.go
@@ -213,6 +213,7 @@ func (tc *TestContext) tryProcessMessage() {
 			}
 		}
 		if gpaMsg != nil {
+			// fmt.Printf("delivering message: %s -> %s %T %+v\n", msg.Sender.ShortString(), nid.ShortString(), gpaMsg, gpaMsg)
 			newMsgs := tc.setMessageSender(nid, tc.nodes[nid].Message(gpaMsg))
 			if newMsgs != nil {
 				tc.msgsSent += len(newMsgs)