diff --git a/tests/input.at b/tests/input.at
index e57990fe..056e5785 100644
--- a/tests/input.at
+++ b/tests/input.at
@@ -1460,7 +1460,7 @@ AT_BISON_CHECK([[-Wno-none input.y]], [[0]], [[]],
 AT_BISON_CHECK([[-Werror,none,yacc input.y]], [[1]], [[]], [[stderr]])
 AT_CHECK([[sed 's/^.*bison:/bison:/' stderr]], [[0]],
 [[bison: warnings being treated as errors
-input.y:2.1-7: error: POSIX Yacc forbids dashes in symbol names: foo-bar [-Werror=yacc]
+input.y:2.1-7: warning: POSIX Yacc forbids dashes in symbol names: foo-bar [-Wyacc]
 ]])
 [mv stderr experr]
 AT_BISON_CHECK([[-Werror,no-all,yacc input.y]], [[1]], [[]], [[experr]])