diff --git a/src/server_cb.erl b/src/server_cb.erl
index 862b9e7..d0dcb49 100644
--- a/src/server_cb.erl
+++ b/src/server_cb.erl
@@ -198,8 +198,7 @@ gsup_cause2dia(?GMM_CAUSE_NET_FAIL) -> {[?DIAMETER_UNABLE_TO_COMPLY], []};
 gsup_cause2dia(?GMM_CAUSE_CONGESTION) -> {[?DIAMETER_UNABLE_TO_COMPLY], []};
 gsup_cause2dia(?GMM_CAUSE_INV_MAND_INFO) -> {[?DIAMETER_MISSING_AVP], []};
 gsup_cause2dia(?GMM_CAUSE_PROTO_ERR_UNSPEC) -> {[?DIAMETER_UNABLE_TO_COMPLY], []};
-% TODO: more values
-gsup_cause2dia(_) -> {fixme, []}.
+gsup_cause2dia(_) -> {[?DIAMETER_UNABLE_TO_COMPLY], []}.
 
 % get the value for a tiven key in Map1. If not found, try same key in Map2. If not found, return Default
 -spec twomap_get(atom(), map(), map(), any()) -> any().