diff --git a/code/STEPFile.h b/code/STEPFile.h
index dfb190726..f97845dd8 100644
--- a/code/STEPFile.h
+++ b/code/STEPFile.h
@@ -598,6 +598,8 @@ namespace STEP {
 
         LazyObject( LazyObject const& ) = delete;
         LazyObject operator=( LazyObject const& ) = delete;
+        LazyObject( LazyObject && ) = delete;
+        LazyObject operator=( LazyObject  && ) = delete;
 
     public: