Index: openacs-4/packages/xotcl-core/www/show-object.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/www/show-object.tcl,v
diff -u -N -r1.22.2.19 -r1.22.2.20
--- openacs-4/packages/xotcl-core/www/show-object.tcl	14 Sep 2016 09:17:19 -0000	1.22.2.19
+++ openacs-4/packages/xotcl-core/www/show-object.tcl	27 Mar 2017 10:37:42 -0000	1.22.2.20
@@ -439,8 +439,8 @@
     }
     set svg "<style>$css</style><div><div class='inner'>$svg</div></div>"
 
-    file delete $tmpfile
-    file delete $tmpnam.dot
+    file delete -- $tmpfile
+    file delete -- $tmpnam.dot
   }
 }