diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/MeshIO/BlendShapeExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/MeshIO/BlendShapeExporter.cs
index 8276891ba..2f2d6f3e4 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/MeshIO/BlendShapeExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/MeshIO/BlendShapeExporter.cs
@@ -48,6 +48,8 @@ namespace UniGLTF
                     positionAccessorIndex = data.ExtendSparseBufferAndGetAccessorIndex(accessorCount,
                         sparseIndices.Select(x => positions[x]).ToArray(), sparseIndices, sparseIndicesViewIndex,
                         glBufferTarget.NONE);
+                    data.Gltf.accessors[positionAccessorIndex].min = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Min(a.x, b.x), Math.Min(a.y, b.y), Mathf.Min(a.z, b.z))).ToArray();
+                    data.Gltf.accessors[positionAccessorIndex].max = positions.Aggregate(positions[0], (a, b) => new Vector3(Mathf.Max(a.x, b.x), Math.Max(a.y, b.y), Mathf.Max(a.z, b.z))).ToArray();
                 }
 
                 // normals