diff --git a/api/binary-compatibility-validator.api b/api/binary-compatibility-validator.api
index 07d3bc3d..8e683d09 100644
--- a/api/binary-compatibility-validator.api
+++ b/api/binary-compatibility-validator.api
@@ -11,7 +11,7 @@ public class kotlinx/validation/ApiValidationExtension {
 	public final fun getPublicMarkers ()Ljava/util/Set;
 	public final fun getPublicPackages ()Ljava/util/Set;
 	public final fun getValidationDisabled ()Z
-	public final fun klib (Lkotlin/jvm/functions/Function1;)V
+	public final fun klib (Lorg/gradle/api/Action;)V
 	public final fun setAdditionalSourceSets (Ljava/util/Set;)V
 	public final fun setApiDumpDirectory (Ljava/lang/String;)V
 	public final fun setIgnoredClasses (Ljava/util/Set;)V
diff --git a/src/main/kotlin/ApiValidationExtension.kt b/src/main/kotlin/ApiValidationExtension.kt
index 7a879775..7bf2b406 100644
--- a/src/main/kotlin/ApiValidationExtension.kt
+++ b/src/main/kotlin/ApiValidationExtension.kt
@@ -6,6 +6,7 @@
 package kotlinx.validation
 
 import kotlinx.validation.api.klib.KlibSignatureVersion
+import org.gradle.api.Action
 
 public open class ApiValidationExtension {
 
@@ -86,8 +87,8 @@ public open class ApiValidationExtension {
      * Configure KLib ABI validation settings.
      */
     @ExperimentalBCVApi
-    public fun klib(block: KlibValidationSettings.() -> Unit) {
-        block(this.klib)
+    public fun klib(config: Action<KlibValidationSettings>) {
+        config.execute(this.klib)
     }
 }