diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 575e3ec36..61c8df484 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -439,7 +439,9 @@ pre_parse_command_line () {
 
     if [ $all_except -eq 0 ]; then
         unsupported=0
+        set -f
         for component in $COMMAND_LINE_COMPONENTS; do
+            set +f
             case $component in
                 *[*?\[]*) continue;;
             esac
@@ -450,6 +452,7 @@ pre_parse_command_line () {
                     unsupported=$((unsupported + 1));;
             esac
         done
+        set +f
         if [ $unsupported -ne 0 ]; then
             exit 2
         fi