diff --git a/src/slic3r/GUI/GLModel.cpp b/src/slic3r/GUI/GLModel.cpp
index 9c9d69526..75998609b 100644
--- a/src/slic3r/GUI/GLModel.cpp
+++ b/src/slic3r/GUI/GLModel.cpp
@@ -1130,6 +1130,7 @@ bool GLModel::send_to_gpu()
         glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
     }
     else {
+        data.index_type = Geometry::EIndexType::UINT;
         glsafe(::glBufferData(GL_ELEMENT_ARRAY_BUFFER, data.indices_size_bytes(), data.indices.data(), GL_STATIC_DRAW));
         glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
     }