diff --git a/rtgui/editorpanel.cc b/rtgui/editorpanel.cc
index 7a234acb3..33dad86ca 100644
--- a/rtgui/editorpanel.cc
+++ b/rtgui/editorpanel.cc
@@ -567,6 +567,7 @@ void EditorPanel::open (Thumbnail* tmb, rtengine::InitialImage* isrc)
         Gtk::Allocation alloc;
         iareapanel->imageArea->on_resized(alloc);
     }
+    history->resetSnapShotNumber();
 }
 
 void EditorPanel::close ()
diff --git a/rtgui/history.h b/rtgui/history.h
index 1c3e9e0b4..daf3b9205 100644
--- a/rtgui/history.h
+++ b/rtgui/history.h
@@ -126,6 +126,7 @@ public:
     void redo ();
 
     bool blistenerLock;
+    void resetSnapShotNumber() {bmnum = 1;};
 };
 
 #endif