diff --git a/ledger/conway/pparams.go b/ledger/conway/pparams.go
index 3296c337..643f0cdf 100644
--- a/ledger/conway/pparams.go
+++ b/ledger/conway/pparams.go
@@ -239,9 +239,9 @@ func (p *ConwayProtocolParameters) Update(
 	}
 }
 
-func (p *ConwayProtocolParameters) UpdateFromGenesis(genesis *ConwayGenesis) {
+func (p *ConwayProtocolParameters) UpdateFromGenesis(genesis *ConwayGenesis) error {
 	if genesis == nil {
-		return
+		return nil
 	}
 	p.MinCommitteeSize = genesis.MinCommitteeSize
 	p.CommitteeTermLimit = genesis.CommitteeTermLimit
@@ -335,6 +335,7 @@ func (p *ConwayProtocolParameters) UpdateFromGenesis(genesis *ConwayGenesis) {
 			Rat: genesis.DRepVotingThresholds.TreasuryWithdrawal.Rat,
 		}
 	}
+	return nil
 }
 
 type ConwayProtocolParameterUpdate struct {
diff --git a/ledger/conway/pparams_test.go b/ledger/conway/pparams_test.go
index 72fc2f7e..3287dab4 100644
--- a/ledger/conway/pparams_test.go
+++ b/ledger/conway/pparams_test.go
@@ -463,7 +463,9 @@ func TestConwayProtocolParamsUpdateFromGenesis(t *testing.T) {
 			t.Fatalf("unexpected error: %s", err)
 		}
 		tmpParams := testDef.startParams
-		tmpParams.UpdateFromGenesis(&tmpGenesis)
+		if err := tmpParams.UpdateFromGenesis(&tmpGenesis); err != nil {
+			t.Fatalf("unexpected error updating pparams from genesis: %s", err)
+		}
 		if !reflect.DeepEqual(tmpParams, testDef.expectedParams) {
 			t.Fatalf(
 				"did not get expected params:\n     got: %#v\n  wanted: %#v",
diff --git a/ledger/shelley/pparams.go b/ledger/shelley/pparams.go
index ce54ace2..f2dceb84 100644
--- a/ledger/shelley/pparams.go
+++ b/ledger/shelley/pparams.go
@@ -98,9 +98,9 @@ func (p *ShelleyProtocolParameters) Update(
 	}
 }
 
-func (p *ShelleyProtocolParameters) UpdateFromGenesis(genesis *ShelleyGenesis) {
+func (p *ShelleyProtocolParameters) UpdateFromGenesis(genesis *ShelleyGenesis) error {
 	if genesis == nil {
-		return
+		return nil
 	}
 	genesisParams := genesis.ProtocolParameters
 	p.MinFeeA = genesisParams.MinFeeA
@@ -130,6 +130,7 @@ func (p *ShelleyProtocolParameters) UpdateFromGenesis(genesis *ShelleyGenesis) {
 	p.ProtocolMajor = genesisParams.ProtocolVersion.Major
 	p.ProtocolMinor = genesisParams.ProtocolVersion.Minor
 	p.MinUtxoValue = genesisParams.MinUtxoValue
+	return nil
 }
 
 type ShelleyProtocolParameterUpdate struct {
diff --git a/ledger/shelley/pparams_test.go b/ledger/shelley/pparams_test.go
index 2bba89f0..2f78db81 100644
--- a/ledger/shelley/pparams_test.go
+++ b/ledger/shelley/pparams_test.go
@@ -95,7 +95,9 @@ func TestShelleyProtocolParamsUpdateFromGenesis(t *testing.T) {
 			t.Fatalf("unexpected error: %s", err)
 		}
 		tmpParams := testDef.startParams
-		tmpParams.UpdateFromGenesis(&tmpGenesis)
+		if err := tmpParams.UpdateFromGenesis(&tmpGenesis); err != nil {
+			t.Fatalf("unexpected error updating pparams from genesis: %s", err)
+		}
 		if !reflect.DeepEqual(tmpParams, testDef.expectedParams) {
 			t.Fatalf(
 				"did not get expected params:\n     got: %#v\n  wanted: %#v",