diff --git a/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/CordaClassResolver.kt b/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/CordaClassResolver.kt
index c41d3fe3ef..682b2f85b3 100644
--- a/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/CordaClassResolver.kt
+++ b/node-api/src/main/kotlin/net/corda/nodeapi/internal/serialization/CordaClassResolver.kt
@@ -6,14 +6,15 @@ import com.esotericsoftware.kryo.io.Output
 import com.esotericsoftware.kryo.serializers.FieldSerializer
 import com.esotericsoftware.kryo.util.DefaultClassResolver
 import com.esotericsoftware.kryo.util.Util
-import net.corda.nodeapi.internal.AttachmentsClassLoader
 import net.corda.core.serialization.ClassWhitelist
 import net.corda.core.serialization.CordaSerializable
 import net.corda.core.serialization.SerializationContext
 import net.corda.core.utilities.contextLogger
+import net.corda.nodeapi.internal.AttachmentsClassLoader
 import net.corda.nodeapi.internal.serialization.amqp.hasAnnotationInHierarchy
 import net.corda.nodeapi.internal.serialization.kryo.ThrowableSerializer
 import java.io.PrintWriter
+import java.lang.reflect.Modifier
 import java.lang.reflect.Modifier.isAbstract
 import java.nio.charset.StandardCharsets
 import java.nio.file.Files
@@ -74,10 +75,21 @@ class CordaClassResolver(serializationContext: SerializationContext) : DefaultCl
 
     override fun registerImplicit(type: Class<*>): Registration {
         val targetType = typeForSerializationOf(type)
+        // Is this a Kotlin object? We use our own reflection here rather than .kotlin.objectInstance because Kotlin
+        // reflection won't work for private objects, and can throw exceptions in other circumstances as well.
         val objectInstance = try {
-            targetType.kotlin.objectInstance
+            targetType.declaredFields.singleOrNull {
+                it.name == "INSTANCE" &&
+                it.type == type &&
+                Modifier.isStatic(it.modifiers) &&
+                Modifier.isFinal(it.modifiers) &&
+                Modifier.isPublic(it.modifiers)
+            }?.let {
+                it.isAccessible = true
+                type.cast(it.get(null)!!)
+            }
         } catch (t: Throwable) {
-            null  // objectInstance will throw if the type is something like a lambda
+            null
         }
 
         // We have to set reference to true, since the flag influences how String fields are treated and we want it to be consistent.