diff --git a/X_X04SA_sscan.json b/X_X04SA_sscan.json
index e6c7589..14eda7c 100644
--- a/X_X04SA_sscan.json
+++ b/X_X04SA_sscan.json
@@ -20,7 +20,7 @@
         {
             "type": "cmd",
             "text": "Scan Data Viewer",
-            "command": "python /sls/controls/applications/mdaviewer/mdaviewer.py"
+            "command": "python3 /sls/controls/applications/mdaviewer/mdaviewer.py"
         }
     ]
 }