diff --git a/lib/krb5/test_fx.c b/lib/krb5/test_fx.c
index 1fc2d5bff..68f00dc63 100644
--- a/lib/krb5/test_fx.c
+++ b/lib/krb5/test_fx.c
@@ -120,6 +120,10 @@ test_cf2(krb5_context context)
     unsigned int i;
     unsigned int errors = 0;
 
+    ret = krb5_allow_weak_crypto(context, 1);
+    if (ret)
+        krb5_err(context, 1, ret, "krb5_allow_weak_crypto");
+
     for (i = 0; i < sizeof(cf2)/sizeof(cf2[0]); i++) {
 	pw.data = cf2[i].p1;
 	pw.length = strlen(cf2[i].p1);