diff --git a/src/widgets/graphicsview/qsimplex_p.h b/src/widgets/graphicsview/qsimplex_p.h
index 842044fa7f..156aa30397 100644
--- a/src/widgets/graphicsview/qsimplex_p.h
+++ b/src/widgets/graphicsview/qsimplex_p.h
@@ -149,6 +149,7 @@ struct QSimplexConstraint
 
 class QSimplex
 {
+    Q_DISABLE_COPY(QSimplex)
 public:
     QSimplex();
     virtual ~QSimplex();