diff --git a/build.gradle.kts b/build.gradle.kts
index d7e5e82..405335b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -20,6 +20,10 @@ java {
 
 kotlin {
     jvmToolchain(25)
+    compilerOptions {
+        // Keep Jackson XML annotations on both Kotlin constructor parameters and properties.
+        freeCompilerArgs.add("-Xannotation-default-target=param-property")
+    }
 }
 
 micronaut {