diff --git a/util/regress b/util/regress
index aa9114ade..8037484f5 100755
--- a/util/regress
+++ b/util/regress
@@ -47,7 +47,7 @@ add_option('--builds',
            'MIPS,' \
            'POWER,' \
            'SPARC,' \
-           'X86, X86_MESI_CMP_directory' \
+           'X86,X86_MESI_CMP_directory,' \
            'ARM',
            help="comma-separated build targets to test (default: '%default')")
 add_option('--modes',