diff --git a/Code/Mantid/instrument/Facilities.xml b/Code/Mantid/instrument/Facilities.xml
index 7c55d1c2f73aeed1f6b7fa592bd58b97b708c455..442fc76adf23cbd4f0801be6727788c2373cc541 100644
--- a/Code/Mantid/instrument/Facilities.xml
+++ b/Code/Mantid/instrument/Facilities.xml
@@ -258,7 +258,8 @@
   </instrument>  
  
   <instrument name="ARGUS">
-    <zeropadding size="7"/>
+    <zeropadding size="7" startRunNumber="1"/>
+    <zeropadding size="8" startRunNumber="57942"/>
     <technique>Muon spectroscopy</technique>
     <technique>Radio frequency muSR</technique>
     <livedata address="NDXARGUS:6789" />