diff --git a/source/blender/blenkernel/BKE_geometry_set.hh b/source/blender/blenkernel/BKE_geometry_set.hh
index 0f9c2c1062b..88e45baad15 100644
--- a/source/blender/blenkernel/BKE_geometry_set.hh
+++ b/source/blender/blenkernel/BKE_geometry_set.hh
@@ -923,9 +923,10 @@ class InstancesComponent : public GeometryComponent {
   int references_amount() const;
 
   /**
-   * Remove the indices in the selection mask and remove unused instance references afterwards.
+   * Remove the indices that are not contained in the mask input, and remove unused instance
+   * references afterwards.
    */
-  void remove_instances(const blender::IndexMask selection);
+  void remove_instances(const blender::IndexMask mask);
 
   blender::Span<int> almost_unique_ids() const;
 
diff --git a/source/blender/blenkernel/intern/geometry_component_instances.cc b/source/blender/blenkernel/intern/geometry_component_instances.cc
index a7e3c5b60dc..b411c793298 100644
--- a/source/blender/blenkernel/intern/geometry_component_instances.cc
+++ b/source/blender/blenkernel/intern/geometry_component_instances.cc
@@ -148,27 +148,27 @@ static void copy_data_based_on_mask(Span<T> src, MutableSpan<T> dst, IndexMask m
   });
 }
 
-void InstancesComponent::remove_instances(const IndexMask selection)
+void InstancesComponent::remove_instances(const IndexMask mask)
 {
   using namespace blender;
-  if (selection.is_range() && selection.index_range().first() == 0) {
+  if (mask.is_range() && mask.as_range().start() == 0) {
     /* Deleting from the end of the array can be much faster since no data has to be shifted. */
-    this->resize(selection.size());
+    this->resize(mask.size());
     this->remove_unused_references();
     return;
   }
 
-  Vector<int> new_handles(selection.size());
-  copy_data_based_on_mask<int>(this->instance_reference_handles(), new_handles, selection);
+  Vector<int> new_handles(mask.size());
+  copy_data_based_on_mask<int>(this->instance_reference_handles(), new_handles, mask);
   instance_reference_handles_ = std::move(new_handles);
-  Vector<float4x4> new_transforms(selection.size());
-  copy_data_based_on_mask<float4x4>(this->instance_transforms(), new_transforms, selection);
+  Vector<float4x4> new_transforms(mask.size());
+  copy_data_based_on_mask<float4x4>(this->instance_transforms(), new_transforms, mask);
   instance_transforms_ = std::move(new_transforms);
 
   const bke::CustomDataAttributes &src_attributes = attributes_;
 
   bke::CustomDataAttributes dst_attributes;
-  dst_attributes.reallocate(selection.size());
+  dst_attributes.reallocate(mask.size());
 
   src_attributes.foreach_attribute(
       [&](const bke::AttributeIDRef &id, const AttributeMetaData &meta_data) {
@@ -182,7 +182,7 @@ void InstancesComponent::remove_instances(const IndexMask selection)
 
         attribute_math::convert_to_static_type(src.type(), [&](auto dummy) {
           using T = decltype(dummy);
-          copy_data_based_on_mask<T>(src.typed<T>(), dst.typed<T>(), selection);
+          copy_data_based_on_mask<T>(src.typed<T>(), dst.typed<T>(), mask);
         });
         return true;
       },
diff --git a/source/blender/nodes/geometry/nodes/node_geo_delete_geometry.cc b/source/blender/nodes/geometry/nodes/node_geo_delete_geometry.cc
index 7d41242b8bc..77546f1ea77 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_delete_geometry.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_delete_geometry.cc
@@ -545,7 +545,7 @@ static void separate_instance_selection(GeometrySet &geometry_set,
   Vector<int64_t> indices;
   const IndexMask mask = index_mask_indices(selection, invert, indices);
 
-  if (mask.size() == 0) {
+  if (mask.is_empty()) {
     geometry_set.remove<InstancesComponent>();
     return;
   }