diff --git a/samples/standalone/kotlin/http-server/build.gradle.kts b/samples/standalone/kotlin/http-server/build.gradle.kts
index f6ac804fe6..fa2f4ccca6 100644
--- a/samples/standalone/kotlin/http-server/build.gradle.kts
+++ b/samples/standalone/kotlin/http-server/build.gradle.kts
@@ -58,7 +58,7 @@ dependencies {
 
 // tag::contract_dsl[]
 contracts {
-	packageWithBaseClasses = objects.property(String::class).value("com.example.fraud")
+	packageWithBaseClasses.set("com.example.fraud")
 }
 // end::contract_dsl[]