diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index 21c6f9744..5953f1dda 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -4351,7 +4351,7 @@ QDataStream &operator>>(QDataStream &s, QImage &image)
         image = QImage(); // null image
         return s;
     }
-    image = QImageReader(s.device(), 0).read();
+    image = QImageReader(s.device(), "png").read();
     return s;
 }
 #endif // QT_NO_DATASTREAM