diff --git a/app/upgrades.go b/app/upgrades.go
index aace34ff56..29f7b9902d 100644
--- a/app/upgrades.go
+++ b/app/upgrades.go
@@ -57,6 +57,7 @@ func (app *App) RegisterUpgradeHandlers(cdc codec.BinaryCodec) {
 		}
 	}
 }
+
 func UpdateExpeditedParams(ctx context.Context, gov govkeeper.Keeper) error {
 	govParams, err := gov.Params.Get(ctx)
 	if err != nil {
@@ -83,7 +84,8 @@ func UpdateExpeditedParams(ctx context.Context, gov govkeeper.Keeper) error {
 	}
 	govParams.ExpeditedThreshold = expeditedThreshold.String()
 	if govParams.ExpeditedVotingPeriod != nil && govParams.VotingPeriod != nil && *govParams.ExpeditedVotingPeriod >= *govParams.VotingPeriod {
-		period := time.Second * time.Duration(DefaultPeriodRatio()*govParams.VotingPeriod.Seconds())
+		votingPeriod := DurationToDec(*govParams.VotingPeriod)
+		period := DecToDuration(DefaultPeriodRatio().Mul(votingPeriod))
 		govParams.ExpeditedVotingPeriod = &period
 	}
 	if err := govParams.ValidateBasic(); err != nil {
@@ -96,6 +98,14 @@ func DefaultThresholdRatio() sdkmath.LegacyDec {
 	return govv1.DefaultExpeditedThreshold.Quo(govv1.DefaultThreshold)
 }
 
-func DefaultPeriodRatio() float64 {
-	return govv1.DefaultExpeditedPeriod.Seconds() / govv1.DefaultPeriod.Seconds()
+func DefaultPeriodRatio() sdkmath.LegacyDec {
+	return DurationToDec(govv1.DefaultExpeditedPeriod).Quo(DurationToDec(govv1.DefaultPeriod))
+}
+
+func DurationToDec(d time.Duration) sdkmath.LegacyDec {
+	return sdkmath.LegacyMustNewDecFromStr(fmt.Sprintf("%f", d.Seconds()))
+}
+
+func DecToDuration(d sdkmath.LegacyDec) time.Duration {
+	return time.Second * time.Duration(d.RoundInt64())
 }
diff --git a/app/upgrades_test.go b/app/upgrades_test.go
index 73e81a5f25..921ffc99c8 100644
--- a/app/upgrades_test.go
+++ b/app/upgrades_test.go
@@ -89,7 +89,8 @@ func (suite *AppTestSuite) TestUpdateExpeditedParams() {
 				suite.govParams.VotingPeriod = &period
 			},
 			exp: func(params govv1.Params) {
-				expected := time.Second * time.Duration(app.DefaultPeriodRatio()*suite.govParams.VotingPeriod.Seconds())
+				votingPeriod := app.DurationToDec(*suite.govParams.VotingPeriod)
+				expected := app.DecToDuration(app.DefaultPeriodRatio().Mul(votingPeriod))
 				suite.Require().Equal(expected, *params.ExpeditedVotingPeriod)
 			},
 		},