diff --git a/cardano-api/internal/Cardano/Api/Query.hs b/cardano-api/internal/Cardano/Api/Query.hs
index 8e8fae2051..d2a8702bb0 100644
--- a/cardano-api/internal/Cardano/Api/Query.hs
+++ b/cardano-api/internal/Cardano/Api/Query.hs
@@ -316,7 +316,7 @@ data QueryInShelleyBasedEra era result where
     :: Set (Shelley.Credential Shelley.ColdCommitteeRole StandardCrypto)
     -> Set (Shelley.Credential Shelley.HotCommitteeRole StandardCrypto)
     -> Set L.MemberStatus
-    -> QueryInShelleyBasedEra era (L.CommitteeMembersState StandardCrypto)
+    -> QueryInShelleyBasedEra era (Maybe (L.CommitteeMembersState StandardCrypto))
 
 
 instance NodeToClientVersionOf (QueryInShelleyBasedEra era result) where
diff --git a/cardano-api/internal/Cardano/Api/Query/Expr.hs b/cardano-api/internal/Cardano/Api/Query/Expr.hs
index bbf2b699f5..e5104f29e4 100644
--- a/cardano-api/internal/Cardano/Api/Query/Expr.hs
+++ b/cardano-api/internal/Cardano/Api/Query/Expr.hs
@@ -268,6 +268,6 @@ queryCommitteeMembersState :: ()
   -> Set (L.Credential L.ColdCommitteeRole L.StandardCrypto)
   -> Set (L.Credential L.HotCommitteeRole L.StandardCrypto)
   -> Set L.MemberStatus
-  -> LocalStateQueryExpr block point (QueryInMode mode) r IO (Either UnsupportedNtcVersionError (Either EraMismatch (L.CommitteeMembersState L.StandardCrypto)))
+  -> LocalStateQueryExpr block point (QueryInMode mode) r IO (Either UnsupportedNtcVersionError (Either EraMismatch (Maybe (L.CommitteeMembersState L.StandardCrypto))))
 queryCommitteeMembersState eraInMode sbe coldCreds hotCreds statuses =
   queryExpr $ QueryInEra eraInMode $ QueryInShelleyBasedEra sbe (QueryCommitteeMembersState coldCreds hotCreds statuses)