diff --git a/run-mmpol.sh b/run-mmpol.sh
index 81df4511059e4e49733f0ef3468c9a4c19892adc..0e493ba24929f36a74791feca8558339b4cb8438 100755
--- a/run-mmpol.sh
+++ b/run-mmpol.sh
@@ -39,4 +39,4 @@ fi
 
 # tag output file with run metadata
 outfile=`ls -t $tmpglobal | head -1`
-mv -n $tmpglobal/$outfile $tmpglobal/$outfile_$filetag
+mv -n $tmpglobal/$outfile $tmpglobal/${outfile}_$filetag