diff --git a/Code/Mantid/instrument/Facilities.xml b/Code/Mantid/instrument/Facilities.xml
index 1a20d7cce78a173a6e7f1cdafb1fb9a074363f1f..4147eaaa427eaea5330945be70d191378e982e60 100644
--- a/Code/Mantid/instrument/Facilities.xml
+++ b/Code/Mantid/instrument/Facilities.xml
@@ -148,7 +148,7 @@
     <technique>Radio frequency muSR</technique>
   </instrument>  
  
-  <instrument name="ARGUS" zeropadding="8">
+  <instrument name="ARGUS" zeropadding="7">
     <technique>Muon spectroscopy</technique>
     <technique>Radio frequency muSR</technique>
   </instrument>