diff --git a/runtime/kusama/src/lib.rs b/runtime/kusama/src/lib.rs
index 3f77ece6c86a..e399d7a0b35e 100644
--- a/runtime/kusama/src/lib.rs
+++ b/runtime/kusama/src/lib.rs
@@ -548,10 +548,19 @@ impl pallet_staking::EraPayout<Balance> for EraPayout {
 parameter_types! {
 	// Six sessions in an era (6 hours).
 	pub const SessionsPerEra: SessionIndex = prod_or_fast!(6, 1);
+
 	// 28 eras for unbonding (7 days).
-	pub const BondingDuration: sp_staking::EraIndex = 28;
+	pub BondingDuration: sp_staking::EraIndex = prod_or_fast!(
+		28,
+		28,
+		"DOT_BONDING_DURATION"
+	);
 	// 27 eras in which slashes can be cancelled (slightly less than 7 days).
-	pub const SlashDeferDuration: sp_staking::EraIndex = 27;
+	pub SlashDeferDuration: sp_staking::EraIndex = prod_or_fast!(
+		27,
+		27,
+		"DOT_SLASH_DEFER_DURATION"
+	);
 	pub const MaxNominatorRewardedPerValidator: u32 = 512;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
 	// 24
diff --git a/runtime/polkadot/src/lib.rs b/runtime/polkadot/src/lib.rs
index 0f71a37f425f..8beb551db376 100644
--- a/runtime/polkadot/src/lib.rs
+++ b/runtime/polkadot/src/lib.rs
@@ -534,9 +534,18 @@ pallet_staking_reward_curve::build! {
 parameter_types! {
 	// Six sessions in an era (24 hours).
 	pub const SessionsPerEra: SessionIndex = prod_or_fast!(6, 1);
+
 	// 28 eras for unbonding (28 days).
-	pub const BondingDuration: sp_staking::EraIndex = 28;
-	pub const SlashDeferDuration: sp_staking::EraIndex = 27;
+	pub BondingDuration: sp_staking::EraIndex = prod_or_fast!(
+		28,
+		28,
+		"DOT_BONDING_DURATION"
+	);
+	pub SlashDeferDuration: sp_staking::EraIndex = prod_or_fast!(
+		27,
+		27,
+		"DOT_SLASH_DEFER_DURATION"
+	);
 	pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
 	pub const MaxNominatorRewardedPerValidator: u32 = 512;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);