diff --git a/plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/util/java9Utils.kt b/plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/util/java9Utils.kt
index 090c6f94a29..ec8a12da3c6 100644
--- a/plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/util/java9Utils.kt
+++ b/plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/util/java9Utils.kt
@@ -57,6 +57,8 @@ fun TreeMaker.TopLevelJava9Aware(packageClause: JCTree.JCExpression?, declaratio
     }
 }
 
+// The cast is not useless on JDK 21
+@Suppress("USELESS_CAST")
 fun JCTree.JCCompilationUnit.getPackageNameJava9Aware(): JCTree? {
     return if (isJava9OrLater()) {
         JCTree.JCCompilationUnit::class.java.getDeclaredMethod("getPackageName").invoke(this) as JCTree?