diff --git a/PythonServer/pos-python-server.py b/PythonServer/pos-python-server.py
index 3ed7c3c142696f8adb66b8494ae0ac2ce8e0836e..d821de39ed140d291b2d36b84d4a83dbb873c30a 100755
--- a/PythonServer/pos-python-server.py
+++ b/PythonServer/pos-python-server.py
@@ -367,7 +367,7 @@ class epicsQuery(Thread):
                     instruments_return_dict[pv]['units']='n.c.'
                     instruments_return_dict[pv]['value']=''
 
-            json_save(instruments_return_dict, '/var/www/data/getInstruments.json')
+            save_json(instruments_return_dict, '/var/www/data/getInstruments.json')
             time.sleep(0.5)
 
         for pv in publicpvs: