diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/nd/Structure2D.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/nd/Structure2D.kt
index e1a1d37de..8e41110fe 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/nd/Structure2D.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/nd/Structure2D.kt
@@ -75,14 +75,14 @@ public interface MutableStructure2D<T> : Structure2D<T>, MutableStructureND<T> {
     /**
      * The buffer of rows of this structure. It gets elements from the structure dynamically.
      */
-    override val rows: List<MutableStructure1D<T>>
-        get() = List(rowNum) { i -> MutableBuffer1DWrapper(VirtualMutableBuffer(colNum) { j -> get(i, j) })}
+    override val rows: MutableList<MutableStructure1D<T>>
+        get() = MutableList(rowNum) { i -> MutableBuffer1DWrapper(VirtualMutableBuffer(colNum) { j -> get(i, j) })}
 
     /**
      * The buffer of columns of this structure. It gets elements from the structure dynamically.
      */
-    override val columns: List<MutableStructure1D<T>>
-        get() = List(colNum) { j -> MutableBuffer1DWrapper(VirtualMutableBuffer(rowNum) { i -> get(i, j) }) }
+    override val columns: MutableList<MutableStructure1D<T>>
+        get() = MutableList(colNum) { j -> MutableBuffer1DWrapper(VirtualMutableBuffer(rowNum) { i -> get(i, j) }) }
 }
 
 /**