diff --git a/src/core/js/webcaosdb.js b/src/core/js/webcaosdb.js
index 0e73af51ee088600f3537caac6031d12165d055e..ee04d2b7a1c6de5cf3faa30b5425b70479682885 100644
--- a/src/core/js/webcaosdb.js
+++ b/src/core/js/webcaosdb.js
@@ -98,7 +98,7 @@ this.connection = new function() {
         this.runScript = async function _runScript(scriptname, params) {
             var pstring = "call=" + scriptname;
             for (var key in params) {
-                pstring += "&O" + key + "=" + params[key];
+                pstring += "&-O" + key + "=" + params[key];
             }
             try {
                 return await $.ajax({