diff --git a/download-and-install-gauche.sh b/download-and-install-gauche.sh
index e1e2490..9101e25 100755
--- a/download-and-install-gauche.sh
+++ b/download-and-install-gauche.sh
@@ -39,7 +39,7 @@ if [ ! -z "$configure_opts" ]; then
 fi
 
 if [ "$binary" = 'true' ]; then
-    if [ $version != 'latest' -o -n $do_test -o -n $configure_opts ]; then
+    if [ "$version" != 'latest' ]; then
         echo "If prebuilt-binary is true, no ther option should be given."
         exit 1
     fi