diff --git a/gas/testsuite/gas/mn10300/.Sanitize b/gas/testsuite/gas/mn10300/.Sanitize
index 39f9a1baaf4..e48e2dfc35a 100644
--- a/gas/testsuite/gas/mn10300/.Sanitize
+++ b/gas/testsuite/gas/mn10300/.Sanitize
@@ -52,6 +52,7 @@ muldiv.s
 other.s
 shift.s
 sub.s
+udf.s
 
 Things-to-lose: