diff --git a/js/xdata.js b/js/xdata.js
index 21fa736..18533cd 100644
--- a/js/xdata.js
+++ b/js/xdata.js
@@ -532,7 +532,7 @@ function parseXDATA(data, pressure){
         }
     }
 
-    if (_instrument.length > 0) _output["xdata_instrument"] = _instruments;
+    if (_instruments.length > 0) _output["xdata_instrument"] = _instruments;
 
     return _output