diff --git a/src/gui/painting/qtriangulator.cpp b/src/gui/painting/qtriangulator.cpp
index ba231364cf7..df96e9f9567 100644
--- a/src/gui/painting/qtriangulator.cpp
+++ b/src/gui/painting/qtriangulator.cpp
@@ -434,6 +434,7 @@ static inline int primeForCount(int count)
 // entire set. A value of -1 is used to mark unused entries.
 class QInt64Set
 {
+    Q_DISABLE_COPY_MOVE(QInt64Set)
 public:
     inline QInt64Set(int capacity = 64);
     inline ~QInt64Set() {delete[] m_array;}