diff --git a/ethclient/gethclient/gethclient_test.go b/ethclient/gethclient/gethclient_test.go
index 02635faabc..97632752ee 100644
--- a/ethclient/gethclient/gethclient_test.go
+++ b/ethclient/gethclient/gethclient_test.go
@@ -86,6 +86,7 @@ func newTestBackend(t *testing.T) (*node.Node, []*types.Block) {
 }
 
 func generateTestChain() (*core.Genesis, []*types.Block) {
+	testTxHashes = nil // reset before generating a new chain
 	genesis := &core.Genesis{
 		Config: params.AllEthashProtocolChanges,
 		Alloc: types.GenesisAlloc{