diff --git a/kafka-connect-neo4j/src/main/kotlin/streams/kafka/connect/common/ConfigurationMigrator.kt b/kafka-connect-neo4j/src/main/kotlin/streams/kafka/connect/common/ConfigurationMigrator.kt
index 179ccbaf..7cb78bfd 100644
--- a/kafka-connect-neo4j/src/main/kotlin/streams/kafka/connect/common/ConfigurationMigrator.kt
+++ b/kafka-connect-neo4j/src/main/kotlin/streams/kafka/connect/common/ConfigurationMigrator.kt
@@ -113,7 +113,7 @@ class ConfigurationMigrator(private val settings: Map<String, String>) {
 
         settings.forEach { (originalKey, value) ->
             val propConverter = propertyConverterMap[originalKey]
-            if (propConverter != null) {
+            if (propConverter != null && propConverter.updatedConfigKey.isNotEmpty()) {
                 val newKey = propConverter.updatedConfigKey
                 updatedConfig[newKey] = propConverter.migrationHandler()
                 log.debug("Migrating configuration {} to {}", originalKey, newKey)
diff --git a/kafka-connect-neo4j/src/test/kotlin/streams/kafka/connect/sink/ConfigurationMigratorTest.kt b/kafka-connect-neo4j/src/test/kotlin/streams/kafka/connect/sink/ConfigurationMigratorTest.kt
index 029be4f6..100d9aea 100644
--- a/kafka-connect-neo4j/src/test/kotlin/streams/kafka/connect/sink/ConfigurationMigratorTest.kt
+++ b/kafka-connect-neo4j/src/test/kotlin/streams/kafka/connect/sink/ConfigurationMigratorTest.kt
@@ -3,6 +3,10 @@ package streams.kafka.connect.sink
 import org.junit.Assert.assertEquals
 import org.junit.Test
 import streams.kafka.connect.common.ConfigurationMigrator
+import streams.kafka.connect.common.Neo4jConnectorConfig.Companion.ENCRYPTION_CA_CERTIFICATE_PATH
+import streams.kafka.connect.source.Neo4jSourceConnectorConfig.Companion.ENFORCE_SCHEMA
+import streams.kafka.connect.source.Neo4jSourceConnectorConfig.Companion.SOURCE_TYPE
+import streams.kafka.connect.source.SourceType
 
 class ConfigurationMigratorTest {
 
@@ -27,7 +31,20 @@ class ConfigurationMigratorTest {
     )
   }
 
-  @Test fun `should not migrate keys with no matching configuration key`() {}
+  @Test fun `should not migrate keys with no matching configuration key`() {
+    // Given a configuration which has no equivalent in the updated connector
+    val originals = mapOf(
+      ENCRYPTION_CA_CERTIFICATE_PATH to "./cert.pem",
+      SOURCE_TYPE to SourceType.QUERY.toString(),
+      ENFORCE_SCHEMA to "true"
+    )
+
+    // When the configuration is migrated
+    val migratedConfig = ConfigurationMigrator(originals).migrate()
+
+    // Then the existing key is not outputted
+    assertEquals("Migrated configuration should be empty", 0, migratedConfig.keys.size)
+  }
 
   @Test
   fun `should migrate time-based keys to new configuration format`() {