diff --git a/node/src/main/kotlin/com/r3corda/node/internal/testing/WalletFiller.kt b/node/src/main/kotlin/com/r3corda/node/internal/testing/WalletFiller.kt
index ca9dc37058..8d87bf0a16 100644
--- a/node/src/main/kotlin/com/r3corda/node/internal/testing/WalletFiller.kt
+++ b/node/src/main/kotlin/com/r3corda/node/internal/testing/WalletFiller.kt
@@ -5,6 +5,7 @@ import com.r3corda.core.contracts.Amount
 import com.r3corda.core.contracts.TransactionBuilder
 import com.r3corda.core.crypto.Party
 import com.r3corda.core.node.ServiceHub
+import com.r3corda.core.serialization.OpaqueBytes
 import java.util.*
 
 object WalletFiller {
@@ -18,7 +19,8 @@ object WalletFiller {
      * the central bank, well ... that'd be a different story altogether.
      */
     fun fillWithSomeTestCash(services: ServiceHub, notary: Party, howMuch: Amount<Currency>, atLeastThisManyStates: Int = 3,
-                             atMostThisManyStates: Int = 10, rng: Random = Random()) {
+                             atMostThisManyStates: Int = 10, rng: Random = Random(),
+                             ref: OpaqueBytes = OpaqueBytes(ByteArray(1, { 0 }))) {
         val amounts = calculateRandomlySizedAmounts(howMuch, atLeastThisManyStates, atMostThisManyStates, rng)
 
         val myIdentity = services.storageService.myLegalIdentity
@@ -29,7 +31,7 @@ object WalletFiller {
         val transactions = amounts.map { pennies ->
             // This line is what makes the cash self issued. We just use zero as our deposit reference: we don't need
             // this field as there's no other database or source of truth we need to sync with.
-            val depositRef = myIdentity.ref(0)
+            val depositRef = myIdentity.ref(ref)
 
             val issuance = TransactionBuilder()
             val freshKey = services.keyManagementService.freshKey()
diff --git a/node/src/main/kotlin/com/r3corda/node/services/wallet/NodeWalletService.kt b/node/src/main/kotlin/com/r3corda/node/services/wallet/NodeWalletService.kt
index b51d8a0f3f..6c015fa373 100644
--- a/node/src/main/kotlin/com/r3corda/node/services/wallet/NodeWalletService.kt
+++ b/node/src/main/kotlin/com/r3corda/node/services/wallet/NodeWalletService.kt
@@ -5,6 +5,7 @@ import com.r3corda.core.contracts.*
 import com.r3corda.core.crypto.SecureHash
 import com.r3corda.core.node.services.Wallet
 import com.r3corda.core.node.services.WalletService
+import com.r3corda.core.serialization.OpaqueBytes
 import com.r3corda.core.serialization.SingletonSerializeAsToken
 import com.r3corda.core.utilities.loggerFor
 import com.r3corda.core.utilities.trace
diff --git a/node/src/test/kotlin/com/r3corda/node/services/NodeWalletServiceTest.kt b/node/src/test/kotlin/com/r3corda/node/services/NodeWalletServiceTest.kt
index ff228c6bd8..c7d870f46f 100644
--- a/node/src/test/kotlin/com/r3corda/node/services/NodeWalletServiceTest.kt
+++ b/node/src/test/kotlin/com/r3corda/node/services/NodeWalletServiceTest.kt
@@ -8,6 +8,7 @@ import com.r3corda.core.contracts.verifyToLedgerTransaction
 import com.r3corda.core.node.ServiceHub
 import com.r3corda.core.node.services.testing.MockKeyManagementService
 import com.r3corda.core.node.services.testing.MockStorageService
+import com.r3corda.core.serialization.OpaqueBytes
 import com.r3corda.core.testing.*
 import com.r3corda.core.utilities.BriefLogFormatter
 import com.r3corda.node.internal.testing.WalletFiller
@@ -40,10 +41,11 @@ class NodeWalletServiceTest {
     @Test
     fun splits() {
         val (wallet, services) = make()
+        val ref = OpaqueBytes(ByteArray(1, {0}))
 
         kms.nextKeys += Array(3) { ALICE_KEY }
         // Fix the PRNG so that we get the same splits every time.
-        WalletFiller.fillWithSomeTestCash(services, DUMMY_NOTARY, 100.DOLLARS, 3, 3, Random(0L))
+        WalletFiller.fillWithSomeTestCash(services, DUMMY_NOTARY, 100.DOLLARS, 3, 3, Random(0L), ref)
 
         val w = wallet.currentWallet
         assertEquals(3, w.states.size)