diff --git a/cmd/end2endtest/helpers.go b/cmd/end2endtest/helpers.go
index 079195b42..6fd477e8c 100644
--- a/cmd/end2endtest/helpers.go
+++ b/cmd/end2endtest/helpers.go
@@ -182,15 +182,28 @@ func (t electionBase) generateProofs(root types.HexBytes, isAnonymousVoting bool
 		}
 	}()
 
+	apiClientMtx := &sync.Mutex{}
 	addNaccounts := func(accounts []*ethereum.SignKeys, wg *sync.WaitGroup) {
 		defer wg.Done()
 		log.Infof("generating %d voting proofs", len(accounts))
 		for _, acc := range accounts {
 			voterKey := acc.Address().Bytes()
+
 			if isAnonymousVoting {
+				apiClientMtx.Lock()
+				privKey := acc.PrivateKey()
+				if err := t.api.SetAccount(privKey.String()); err != nil {
+					apiClientMtx.Unlock()
+					log.Fatal(err)
+					return
+				}
 				voterKey = t.api.MyZkAddress().Bytes()
 			}
+
 			pr, err := t.api.CensusGenProof(root, voterKey)
+			if isAnonymousVoting {
+				apiClientMtx.Unlock()
+			}
 			if err != nil {
 				log.Fatal(err)
 			}
@@ -242,7 +255,6 @@ func getCensusParticipantKey(voterAccount *ethereum.SignKeys, censusType string)
 	case vapi.CensusTypeWeighted:
 		key = voterAccount.Address().Bytes()
 	case vapi.CensusTypeZKWeighted:
-		fmt.Println("salito")
 		zkAddr, err := zk.AddressFromSignKeys(voterAccount)
 		if err != nil {
 			return nil, err