diff --git a/gramps/gen/plug/docgen/treedoc.py b/gramps/gen/plug/docgen/treedoc.py
index 7d78274f0..4918090ae 100644
--- a/gramps/gen/plug/docgen/treedoc.py
+++ b/gramps/gen/plug/docgen/treedoc.py
@@ -461,7 +461,8 @@ class TreeDocBase(BaseDoc, TreeDoc):
             if os.path.isfile(path):
                 if win():
                     path = path.replace('\\', '/')
-                self.write(level+1, 'image = {%s},\n' % path)
+                self.write(level+1, 'image = {{%s}%s},\n' %
+                           os.path.splitext(path))
                 break # first image only
         self.write(level, '}\n')