diff --git a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/CustomCheckpointSerializerTest.kt b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/CustomCheckpointSerializerTest.kt
index 7be91118f3..5937a37c5d 100644
--- a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/CustomCheckpointSerializerTest.kt
+++ b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/CustomCheckpointSerializerTest.kt
@@ -2,6 +2,7 @@ package net.corda.node.customcheckpointserializer
 
 import com.nhaarman.mockito_kotlin.doReturn
 import com.nhaarman.mockito_kotlin.whenever
+import net.corda.core.crypto.generateKeyPair
 import net.corda.core.serialization.EncodingWhitelist
 import net.corda.core.serialization.internal.CheckpointSerializationContext
 import net.corda.core.serialization.internal.checkpointDeserialize
@@ -46,7 +47,8 @@ class CustomCheckpointSerializerTest(private val compression: CordaSerialization
                 TestCorDapp.TestAbstractClassSerializer(),
                 TestCorDapp.TestClassSerializer(),
                 TestCorDapp.TestInterfaceSerializer(),
-                TestCorDapp.TestFinalClassSerializer()
+                TestCorDapp.TestFinalClassSerializer(),
+                TestCorDapp.BrokenPublicKeySerializer()
         ))
     }
 
@@ -70,6 +72,20 @@ class CustomCheckpointSerializerTest(private val compression: CordaSerialization
         testBrokenMapSerialization(DifficultToSerialize.BrokenMapFinal())
     }
 
+    @Test(timeout=300_000)
+    fun `test PublicKey serializer has not been overridden`() {
+
+        val publicKey = generateKeyPair().public
+
+        // Serialize/deserialize
+        val checkpoint = publicKey.checkpointSerialize(context)
+        val deserializedCheckpoint = checkpoint.checkpointDeserialize(context)
+
+        // Check the elements are as expected
+        Assert.assertArrayEquals(publicKey.encoded, deserializedCheckpoint.encoded)
+    }
+
+
     private fun testBrokenMapSerialization(brokenMap : MutableMap<String, String>): MutableMap<String, String> {
         // Add elements to the map
         brokenMap.putAll(mapOf("key" to "value"))
diff --git a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/MockNetworkCustomCheckpointSerializerTest.kt b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/MockNetworkCustomCheckpointSerializerTest.kt
index fee20a4cd1..5bd60293c4 100644
--- a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/MockNetworkCustomCheckpointSerializerTest.kt
+++ b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/MockNetworkCustomCheckpointSerializerTest.kt
@@ -64,4 +64,12 @@ class MockNetworkCustomCheckpointSerializerTest {
         val result = node.startFlow(TestCorDapp.TestFlowWithDifficultToSerializeLocalVariableAsFinal(5)).get()
         Assertions.assertThat(result).isEqualTo(5)
     }
+
+    @Test(timeout = 300_000)
+    @Suspendable
+    fun `check PublicKey serializer has not been overridden`() {
+        val node = mockNetwork.createPartyNode()
+        val result = node.startFlow(TestCorDapp.TestFlowCheckingPublicKeySerializer()).get()
+        Assertions.assertThat(result.encoded).isEqualTo(node.info.legalIdentities.first().owningKey.encoded)
+    }
 }
diff --git a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/TestCorDapp.kt b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/TestCorDapp.kt
index b13c8092f0..ee94fc62d0 100644
--- a/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/TestCorDapp.kt
+++ b/node/src/integration-test/kotlin/net/corda/node/customcheckpointserializer/TestCorDapp.kt
@@ -1,12 +1,14 @@
 package net.corda.node.customcheckpointserializer
 
 import co.paralleluniverse.fibers.Suspendable
+import net.corda.core.flows.FlowException
 import net.corda.core.flows.FlowLogic
 import net.corda.core.flows.StartableByRPC
 import net.corda.core.serialization.CheckpointCustomSerializer
 import net.corda.testing.node.internal.CustomCordapp
 import net.corda.testing.node.internal.enclosedCordapp
 import org.assertj.core.api.Assertions
+import java.security.PublicKey
 import java.time.Duration
 
 /**
@@ -109,6 +111,23 @@ class TestCorDapp {
         }
     }
 
+
+    @StartableByRPC
+    class TestFlowCheckingPublicKeySerializer :
+            FlowLogic<PublicKey>() {
+
+        @Suspendable
+        override fun call(): PublicKey {
+            val ref = ourIdentity.owningKey
+
+            // Force a checkpoint
+            sleep(Duration.ofSeconds(0))
+
+            // Return deserialized object
+            return ref
+        }
+    }
+
     // Custom serializers
 
     @Suppress("unused")
@@ -166,4 +185,16 @@ class TestCorDapp {
                     .also { it.putAll(proxy) }
         }
     }
+
+    @Suppress("unused")
+    class BrokenPublicKeySerializer :
+            CheckpointCustomSerializer<PublicKey, String> {
+        override fun toProxy(obj: PublicKey): String {
+            throw FlowException("Broken on purpose")
+        }
+
+        override fun fromProxy(proxy: String): PublicKey {
+            throw FlowException("Broken on purpose")
+        }
+    }
 }