diff --git a/src/web/WrepJSon.cc b/src/web/WrepJSon.cc
index e1bd8274..a5db95dd 100644
--- a/src/web/WrepJSon.cc
+++ b/src/web/WrepJSon.cc
@@ -1938,7 +1938,7 @@ void WrepJSon::visit(TextVisitor& text) {
         text.update("json", "station_name", station_name_);
         if (!expver_.empty() && expver_ != "0001")
             text.update("json", "expver", " [" + expver_ + "] ");
-        text.update("json", "ens_height", tostring(epsz_));
+        text.update("json", "ens_height", maground(epsz_));
     }
 
     text.update("json", "product_info", product_info_);