diff --git a/finance/isolated/src/main/kotlin/net/corda/finance/contracts/isolated/IsolatedDummyFlow.kt b/finance/isolated/src/main/kotlin/net/corda/finance/contracts/isolated/IsolatedDummyFlow.kt
index 97c35c2af3..a065b49c43 100644
--- a/finance/isolated/src/main/kotlin/net/corda/finance/contracts/isolated/IsolatedDummyFlow.kt
+++ b/finance/isolated/src/main/kotlin/net/corda/finance/contracts/isolated/IsolatedDummyFlow.kt
@@ -9,6 +9,7 @@ import net.corda.core.identity.Party
  * loaded or blocked.
  */
 class IsolatedDummyFlow {
+    @StartableByRPC
     @InitiatingFlow
     class Initiator(val toWhom: Party) : FlowLogic<Unit>() {
         @Suspendable
diff --git a/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/Kryo.kt b/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/Kryo.kt
index 06820db6c2..82234df40b 100644
--- a/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/Kryo.kt
+++ b/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/Kryo.kt
@@ -521,7 +521,7 @@ object LoggerSerializer : Serializer<Logger>() {
 object ClassSerializer : Serializer<Class<*>>() {
     override fun read(kryo: Kryo, input: Input, type: Class<Class<*>>): Class<*> {
         val className = input.readString()
-        return Class.forName(className)
+        return Class.forName(className, true, kryo.classLoader)
     }
 
     override fun write(kryo: Kryo, output: Output, clazz: Class<*>) {
diff --git a/node/src/integration-test/resources/net/corda/node/services/isolated.jar b/node/src/integration-test/resources/net/corda/node/services/isolated.jar
index b1dfc71dac..05544ab868 100644
Binary files a/node/src/integration-test/resources/net/corda/node/services/isolated.jar and b/node/src/integration-test/resources/net/corda/node/services/isolated.jar differ
diff --git a/node/src/test/kotlin/net/corda/node/internal/cordapp/CordappLoaderTest.kt b/node/src/test/kotlin/net/corda/node/internal/cordapp/CordappLoaderTest.kt
index e333595f35..628077d8c1 100644
--- a/node/src/test/kotlin/net/corda/node/internal/cordapp/CordappLoaderTest.kt
+++ b/node/src/test/kotlin/net/corda/node/internal/cordapp/CordappLoaderTest.kt
@@ -55,6 +55,8 @@ class CordappLoaderTest {
         assertThat(actualCordapp.rpcFlows).isEmpty()
         assertThat(actualCordapp.schedulableFlows).isEmpty()
         assertThat(actualCordapp.services).isEmpty()
+        assertThat(actualCordapp.serializationWhitelists).hasSize(1)
+        assertThat(actualCordapp.serializationWhitelists.first().javaClass.name).isEqualTo("net.corda.finance.contracts.isolated.IsolatedPlugin")
         assertThat(actualCordapp.jarPath).isEqualTo(isolatedJAR)
     }