diff --git a/releng/auto_isocontent b/releng/auto_isocontent
index b36226e8..d949bad4 100755
--- a/releng/auto_isocontent
+++ b/releng/auto_isocontent
@@ -139,7 +139,7 @@ extattrs=no
 if ( setfattr -n user.test_xattr -v test_value "$acl_xattr_test_file" ) \
    >/dev/null 2>&1
 then
-  if ( getfattr "$acl_xattr_test_file" ) >/dev/null 2>&1
+  if ( getfattr -d "$acl_xattr_test_file" ) >/dev/null 2>&1
   then
     xattrs=yes
     setfattr -n user.long_data -v 0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789 "$acl_xattr_test_file"