diff --git a/src/gui/painting/qrgba64.h b/src/gui/painting/qrgba64.h
index 0e0b5678901..30d5e244b8f 100644
--- a/src/gui/painting/qrgba64.h
+++ b/src/gui/painting/qrgba64.h
@@ -181,7 +181,7 @@ public:
         return rgba;
     }
 
-    QRgba64 operator=(quint64 _rgba)
+    QRgba64 &operator=(quint64 _rgba) noexcept
     {
         rgba = _rgba;
         return *this;