diff --git a/protocol/localstatequery/queries.go b/protocol/localstatequery/queries.go
index 2db987bc..768f88db 100644
--- a/protocol/localstatequery/queries.go
+++ b/protocol/localstatequery/queries.go
@@ -150,7 +150,13 @@ non_myopic_rewards	{ *poolid => int }	int is the amount of lovelaces each pool w
 type NonMyopicMemberRewardsResult interface{}
 
 type CurrentProtocolParamsResult interface {
-	ledger.BabbageProtocolParameters | any // TODO: add more per-era types
+	ledger.AllegraProtocolParameters |
+		ledger.AlonzoProtocolParameters |
+		ledger.BabbageProtocolParameters |
+		ledger.ConwayProtocolParameters |
+		ledger.MaryProtocolParameters |
+		ledger.ShelleyProtocolParameters |
+		any
 }
 
 // TODO