diff --git a/transsetter.sh b/transsetter.sh
index 14fbbe9..0b813ce 100755
--- a/transsetter.sh
+++ b/transsetter.sh
@@ -32,17 +32,20 @@ if ! which xshove > /dev/null; then
 fi
 
 wlist=$(mktemp)
-
+oldwlist=$(mktemp)
 while true; do
   xshove > $wlist
   while read wprop; do
     wid=$(echo ${wprop} | awk '{print $1}')
-    wclass=$(echo ${wprop} | awk '{print $3}')
-		if [ "$wclass" = "${geditor}" ]; then
-			$setter -i 0x$wid ${opacity} > /dev/null
-		elif [ "${wclass}" = "${termprog}" ]; then
-			$setter -i 0x$wid ${opacity} > /dev/null
+    if ! grep $wid $oldwlist > /dev/null; then
+      wclass=$(echo ${wprop} | awk '{print $3}')
+	  	if [ "$wclass" = "${geditor}" ]; then
+		  	$setter -i 0x$wid ${opacity} > /dev/null
+		  elif [ "${wclass}" = "${termprog}" ]; then
+			  $setter -i 0x$wid ${opacity} > /dev/null
+	    fi
 	  fi
   done < $wlist
+  cat $wlist > $oldwlist;
   sleep 0.2
 done