diff --git a/kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/INDArrayIterators.kt b/kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/INDArrayIterators.kt
index 426b1ec2d..f6efdc0ba 100644
--- a/kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/INDArrayIterators.kt
+++ b/kmath-nd4j/src/main/kotlin/scientifik.kmath.nd4j/INDArrayIterators.kt
@@ -6,7 +6,7 @@ import org.nd4j.linalg.api.shape.Shape
 internal sealed class INDArrayIteratorBase<T>(protected val iterateOver: INDArray) : Iterator<Pair<IntArray, T>> {
     private var i: Int = 0
 
-    override fun hasNext(): Boolean = i < iterateOver.length()
+    final override fun hasNext(): Boolean = i < iterateOver.length()
 
     abstract fun getSingle(indices: LongArray): T