diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/build.gradle.kts b/plugins/kotlin-serialization/kotlin-serialization-compiler/build.gradle.kts
index 51584513007..b0c45c2a580 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/build.gradle.kts
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/build.gradle.kts
@@ -47,11 +47,3 @@ projectTest(parallel = true) {
 
 apply(from = "$rootDir/gradle/kotlinPluginPublication.gradle.kts")
 
-
-tasks {
-    val compileKotlin by existing(org.jetbrains.kotlin.gradle.tasks.KotlinCompile::class) {
-        kotlinOptions {
-            freeCompilerArgs += "-Xopt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI"
-        }
-    }
-}