diff --git a/src/vfs/extfs/helpers/iso9660.in b/src/vfs/extfs/helpers/iso9660.in
index 76273522e..f9c6e50ef 100644
--- a/src/vfs/extfs/helpers/iso9660.in
+++ b/src/vfs/extfs/helpers/iso9660.in
@@ -222,8 +222,8 @@ case "$cmd" in
     ;;
   copyout)
     xorriso_copyout "$@" || {
-        test_iso "$@";
-        mcisofs_copyout "$@";
+        test_iso "$@" || exit 1
+        mcisofs_copyout "$@" || exit 1
     }
     exit 0
     ;;