diff --git a/matlab/PosteriorIRF.m b/matlab/PosteriorIRF.m
index ddceaf4db..d84ae19ed 100644
--- a/matlab/PosteriorIRF.m
+++ b/matlab/PosteriorIRF.m
@@ -84,6 +84,8 @@ elseif strcmpi(type,'gsa')
 else
     MhDirectoryName = CheckPath('prior');
 end
+delete([MhDirectoryName filesep M_.fname '_IRF_DSGEs*.mat']);
+delete([MhDirectoryName filesep M_.fname '_IRF_BVARDSGEs*.mat']);
 if strcmpi(type,'posterior')
     load([ MhDirectoryName filesep  M_.fname '_mh_history.mat'])
     TotalNumberOfMhDraws = sum(record.MhDraws(:,1));