diff --git a/x/params/keeper_test.go b/x/params/keeper_test.go
index a733a97d94..29c05d111e 100644
--- a/x/params/keeper_test.go
+++ b/x/params/keeper_test.go
@@ -28,8 +28,8 @@ func defaultContext(key sdk.StoreKey, tkey sdk.StoreKey) sdk.Context {
 type s struct{}
 
 func createTestCodec() *codec.Codec {
-	cdc := codec.NewCodec()
-	sdk.RegisterWire(cdc)
+	cdc := codec.New()
+	sdk.RegisterCodec(cdc)
 	cdc.RegisterConcrete(s{}, "test/s", nil)
 	return cdc
 }
@@ -51,7 +51,7 @@ func TestKeeper(t *testing.T) {
 	skey := sdk.NewKVStoreKey("test")
 	tkey := sdk.NewTransientStoreKey("transient_test")
 	ctx := defaultContext(skey, tkey)
-	space := NewKeeper(codec.NewCodec(), skey, tkey).Subspace("test")
+	space := NewKeeper(codec.New(), skey, tkey).Subspace("test")
 
 	for _, kv := range kvs {
 		require.NotPanics(t, func() { space.Set(ctx, kv.key, kv.param) })
diff --git a/x/slashing/genesis.go b/x/slashing/genesis.go
index e5a58ba0a0..2af5e41045 100644
--- a/x/slashing/genesis.go
+++ b/x/slashing/genesis.go
@@ -21,8 +21,8 @@ func DefaultGenesisState() GenesisState {
 // and the keeper's address to pubkey map
 func InitGenesis(ctx sdk.Context, keeper Keeper, data GenesisState, sdata types.GenesisState) {
 	for _, validator := range sdata.Validators {
-		keeper.addPubkey(ctx, validator.KeyGetPub())
+		keeper.addPubkey(ctx, validator.GetPubKey())
 	}
 
-	keeper.paramstore.SetFromParamStruct(data.Params)
+	keeper.paramstore.SetFromParamStruct(ctx, &data.Params)
 }
diff --git a/x/slashing/params.go b/x/slashing/params.go
index 2cd3347340..f2a8a53d49 100644
--- a/x/slashing/params.go
+++ b/x/slashing/params.go
@@ -4,6 +4,7 @@ import (
 	"time"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/params"
 )
 
 // Default parameter namespace
@@ -33,6 +34,18 @@ type Params struct {
 	SlashFractionDowntime    sdk.Dec       `json:"slash-fraction-downtime"`
 }
 
+func (p *Params) KeyFieldPairs() params.KeyFieldPairs {
+	return params.KeyFieldPairs{
+		{KeyMaxEvidenceAge, &p.MaxEvidenceAge},
+		{KeySignedBlocksWindow, &p.SignedBlocksWindow},
+		{KeyMinSignedPerWindow, &p.MinSignedPerWindow},
+		{KeyDoubleSignUnbondDuration, &p.DoubleSignUnbondDuration},
+		{KeyDowntimeUnbondDuration, &p.DowntimeUnbondDuration},
+		{KeySlashFractionDoubleSign, &p.SlashFractionDoubleSign},
+		{KeySlashFractionDowntime, &p.SlashFractionDowntime},
+	}
+}
+
 // Default parameters used by Cosmos Hub
 func DefaultParams() Params {
 	return Params{