diff --git a/java/src/com/tightvnc/vncviewer/VncCanvas.java b/java/src/com/tightvnc/vncviewer/VncCanvas.java
index e0ca583..7a8c76a 100644
--- a/java/src/com/tightvnc/vncviewer/VncCanvas.java
+++ b/java/src/com/tightvnc/vncviewer/VncCanvas.java
@@ -251,6 +251,12 @@
     updateFramebufferSize();
   }
 
+  void setScalingFactor(int sf) {
+    scalingFactor = sf;
+    updateFramebufferSize();
+    invalidate();
+  }
+
   void updateFramebufferSize() {
 
     // Useful shortcuts.