diff --git a/src/TNL/Meshes/MeshDetails/MeshEntityIndex.h b/src/TNL/Meshes/MeshDetails/MeshEntityIndex.h
index 1537f62adc98814e55777e2a2cd4201e26fd222b..a0c303a8431d8e6ff0983b4ba330531988cce4f9 100644
--- a/src/TNL/Meshes/MeshDetails/MeshEntityIndex.h
+++ b/src/TNL/Meshes/MeshDetails/MeshEntityIndex.h
@@ -31,6 +31,7 @@ public:
       : id( -1 )
    {}
 
+   __cuda_callable__
    const IDType& getIndex() const
    {
       TNL_ASSERT( this->id >= 0, );