diff --git a/pkl-codegen-kotlin/src/main/kotlin/org/pkl/codegen/kotlin/CliKotlinCodeGeneratorOptions.kt b/pkl-codegen-kotlin/src/main/kotlin/org/pkl/codegen/kotlin/CliKotlinCodeGeneratorOptions.kt
index 72e65eaa..2800fdea 100644
--- a/pkl-codegen-kotlin/src/main/kotlin/org/pkl/codegen/kotlin/CliKotlinCodeGeneratorOptions.kt
+++ b/pkl-codegen-kotlin/src/main/kotlin/org/pkl/codegen/kotlin/CliKotlinCodeGeneratorOptions.kt
@@ -39,5 +39,5 @@ data class CliKotlinCodeGeneratorOptions(
   val implementSerializable: Boolean = false
 ) {
   fun toKotlinCodegenOptions(): KotlinCodegenOptions =
-    KotlinCodegenOptions(indent, generateKdoc, generateSpringBootConfig)
+    KotlinCodegenOptions(indent, generateKdoc, generateSpringBootConfig, implementSerializable)
 }