diff --git a/rtgui/editorpanel.cc b/rtgui/editorpanel.cc
index d3c1bbff8..af4bd1401 100644
--- a/rtgui/editorpanel.cc
+++ b/rtgui/editorpanel.cc
@@ -38,6 +38,7 @@ EditorPanel::EditorPanel (FilePanel* filePanel)
     epih->pending = 0;
 
     processingStartedTime = 0;
+    firstProcessingDone = false;
 
 // construct toolpanelcoordinator
     tpc = new ToolPanelCoordinator ();
@@ -609,6 +610,11 @@ void EditorPanel::refreshProcessingState (bool inProcessingP) {
 		// Set progress bar "done"
     	s->str = "PROGRESSBAR_READY";
     	s->val = 1.0;
+
+#ifdef WIN32
+        if (!firstProcessingDone && (RTWindow*)parent->getIsFullscreen()) { parent->fullscreen(); }
+#endif
+        firstProcessingDone = true;
 }
 
     isProcessing=inProcessingP;
diff --git a/rtgui/editorpanel.h b/rtgui/editorpanel.h
index 6dc722871..f93ea0aea 100644
--- a/rtgui/editorpanel.h
+++ b/rtgui/editorpanel.h
@@ -94,6 +94,7 @@ class EditorPanel : public Gtk::VBox,
         BatchToolPanelCoordinator* btpCoordinator;        
         FilePanel* fPanel;
       
+        bool firstProcessingDone;
     
         Thumbnail* openThm;  // may get invalid on external delete event
         Glib::ustring fname;  // must be safed seperately
diff --git a/rtgui/rtwindow.h b/rtgui/rtwindow.h
index 7f076c70c..07c6b5ee4 100644
--- a/rtgui/rtwindow.h
+++ b/rtgui/rtwindow.h
@@ -77,6 +77,8 @@ class RTWindow : public Gtk::Window, public rtengine::ProgressListener{
         void SetMainCurrent();
         void MoveFileBrowserToEditor();
         void MoveFileBrowserToMain();
+
+        bool getIsFullscreen() { return is_fullscreen; }
 };
 
 #endif