diff --git a/HTTPServer.cpp b/HTTPServer.cpp
index d0895cbc..f35e02d3 100644
--- a/HTTPServer.cpp
+++ b/HTTPServer.cpp
@@ -612,7 +612,7 @@ namespace http {
 			HandleCommand (req, res, s);
 		} else {
 			ShowStatus (s);
-			res.add_header("Refresh", 10");
+			res.add_header("Refresh", "10");
 		}
 		ShowPageTail (s);