diff --git a/archivers/xzize.sh b/archivers/xzize.sh
index fd263d6..c32e4ef 100755
--- a/archivers/xzize.sh
+++ b/archivers/xzize.sh
@@ -36,7 +36,7 @@ test_extension()
         NEWEXTENSION="$3"
     fi
 
-    BASE="$(basename "$FILE" ."$EXTENSION")"
+    BASE="$(echo "$FILE" | sed "s/\.${EXTENSION}//")"
     if [ "$BASE" != "$FILE" ] ; then
         DEST="$BASE".$NEWEXTENSION
         return 0