diff --git a/layers.personal/orgtools/local/ob-mermaid/ob-mermaid.el b/layers.personal/orgtools/local/ob-mermaid/ob-mermaid.el
index 5f79743..714e0e2 100644
--- a/layers.personal/orgtools/local/ob-mermaid/ob-mermaid.el
+++ b/layers.personal/orgtools/local/ob-mermaid/ob-mermaid.el
@@ -73,8 +73,9 @@
 
 (defun mermaid-run (fmt in-file out-file)
   (cond ((string= fmt "svg")
-         (copy-file (concat (file-name-nondirectory in-file) ".svg") 
-		    out-file))
+         (copy-file (concat in-file ".svg") 
+                    out-file
+                    :ok-if-exists t))
         (t (mermaid-shell-command org-babel-temporary-directory 
                                   (concat org-mermaid-convert " "
                                           (file-name-nondirectory in-file)