diff --git a/event-logger/src/main/kotlin/events.kt b/event-logger/src/main/kotlin/events.kt
index 9fbbae9c8..8a68eef17 100644
--- a/event-logger/src/main/kotlin/events.kt
+++ b/event-logger/src/main/kotlin/events.kt
@@ -7,6 +7,18 @@ package org.signal.event
 
 import java.util.Collections
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.modules.SerializersModule
+import kotlinx.serialization.modules.polymorphic
+import kotlinx.serialization.modules.subclass
+
+val module = SerializersModule {
+    polymorphic(Event::class) {
+        subclass(RemoteConfigSetEvent::class)
+        subclass(RemoteConfigDeleteEvent::class)
+    }
+}
+val jsonFormat = Json { serializersModule = module }
 
 sealed interface Event
 
diff --git a/event-logger/src/main/kotlin/loggers.kt b/event-logger/src/main/kotlin/loggers.kt
index 9ff57f0e7..4ce29db55 100644
--- a/event-logger/src/main/kotlin/loggers.kt
+++ b/event-logger/src/main/kotlin/loggers.kt
@@ -12,7 +12,6 @@ import com.google.cloud.logging.Severity
 import com.google.protobuf.Struct
 import com.google.protobuf.util.JsonFormat
 import kotlinx.serialization.encodeToString
-import kotlinx.serialization.json.Json
 
 interface AdminEventLogger {
     fun logEvent(event: Event, labels: Map<String, String>?)
@@ -26,7 +25,7 @@ class NoOpAdminEventLogger : AdminEventLogger {
 class GoogleCloudAdminEventLogger(private val logging: Logging, private val logName: String) : AdminEventLogger {
     override fun logEvent(event: Event, labels: Map<String, String>?) {
         val structBuilder = Struct.newBuilder()
-        JsonFormat.parser().merge(Json.encodeToString(event), structBuilder)
+        JsonFormat.parser().merge(jsonFormat.encodeToString(event), structBuilder)
         val struct = structBuilder.build()
 
         val logEntryBuilder = LogEntry.newBuilder(JsonPayload.of(struct))