diff --git a/src/ImageViewer.cpp b/src/ImageViewer.cpp
--- a/src/ImageViewer.cpp
+++ b/src/ImageViewer.cpp
@@ -117,7 +117,7 @@
 // ------------------------------------------------------------------------
 void ImageViewer::zoomActualSize()
 {
-    setMatrix(QMatrix());
+    resetTransform();
 }
 
 // ------------------------------------------------------------------------