diff --git a/ResultToVcf.sh b/ResultToVcf.sh
index 68b2911..7148abf 100755
--- a/ResultToVcf.sh
+++ b/ResultToVcf.sh
@@ -7,7 +7,7 @@ sa=`echo $aRes | tr "_" "\t" | awk '{ print $2;}'`
 sb=`echo $bRes | tr "_" "\t" | awk '{ print $2;}'`
 ha=`echo $aRes | tr "_" "\t" | awk '{ print $3;}' | tr -d "h"`
 hb=`echo $bRes | tr "_" "\t" | awk '{ print $3;}' | tr -d "h"`
-if [[ $sb -eq "" ]]; then
+if [[ -z "$sb" ]]; then
 	sb=$sa
 	hb=$ha
 fi