diff --git a/roofit/roofitcore/inc/RooCustomizer.h b/roofit/roofitcore/inc/RooCustomizer.h
index 8fdd3c4a53acf..56b85f8ae9769 100644
--- a/roofit/roofitcore/inc/RooCustomizer.h
+++ b/roofit/roofitcore/inc/RooCustomizer.h
@@ -69,9 +69,13 @@ class RooCustomizer {
 
   RooAbsPdf const& pdf() const;
 
+  RooCustomizer(const RooCustomizer &) = delete;
+  RooCustomizer &operator=(const RooCustomizer &) = delete;
+  RooCustomizer(RooCustomizer &&) = delete;
+  RooCustomizer &operator=(RooCustomizer &&) = delete;
+
 protected:
 
-  RooCustomizer(const RooCustomizer&) ;
   void initialize() ;
 
   RooAbsArg* doBuild(const char* masterCatState, bool verbose) ;