diff --git a/RTCP/Interface/src/Parset.cc b/RTCP/Interface/src/Parset.cc
index 7638bbafabc03de671216de979949eaccc5529a2..ae9c5514e7e21c979824a4825d914de0d7876ad2 100644
--- a/RTCP/Interface/src/Parset.cc
+++ b/RTCP/Interface/src/Parset.cc
@@ -202,7 +202,7 @@ string Parset::constructBeamFormedFilename( const string &mask, unsigned beam, u
   replace_all(name, "${MINUTES}", splitStartTime[4]);
   replace_all(name, "${SECONDS}", splitStartTime[5]);
 
-  replace_all(name, "${MSNUMBER}", str(format("%05u") % observationID()));
+  replace_all(name, "${OBSID}", str(format("%05u") % observationID()));
   //replace_all(name, "${SAP}", str(format("%02u") % subbandToSAPmapping()[beamnr])); // station beams not supported yet
   replace_all(name, "${PART}", str(format("%03u") % file));
   replace_all(name, "${BEAM}", str(format("%03u") % beam));
@@ -228,7 +228,7 @@ string Parset::constructSubbandFilename( const string &mask, unsigned subband )
   replace_all(name, "${MINUTES}", splitStartTime[4]);
   replace_all(name, "${SECONDS}", splitStartTime[5]);
 
-  replace_all(name, "${MSNUMBER}", str(format("%05u") % observationID()));
+  replace_all(name, "${OBSID}", str(format("%05u") % observationID()));
   replace_all(name, "${SAP}", str(format("%02u") % subbandToSAPmapping()[subband]));
   replace_all(name, "${SUBBAND}", str(format("%03u") % subband));