diff --git a/frame/staking/src/lib.rs b/frame/staking/src/lib.rs
index 28e1ab042..c2bcc0faa 100644
--- a/frame/staking/src/lib.rs
+++ b/frame/staking/src/lib.rs
@@ -1887,8 +1887,8 @@ impl<T: Trait> Module<T> {
 			let validators = Self::current_elected();
 			let (total_payout, max_payout) = inflation::compute_total_payout::<T>(
 				era_duration,
-				T::Time::now() - T::GenesisTime::get(),
-				T::Cap::get() - T::RingCurrency::total_issuance(),
+				now - T::GenesisTime::get(),
+				T::Cap::get().saturating_sub(T::RingCurrency::total_issuance()),
 				PayoutFraction::get(),
 			);
 			let mut total_imbalance = <RingPositiveImbalance<T>>::zero();
diff --git a/frame/staking/src/mock.rs b/frame/staking/src/mock.rs
index 94a56d2d9..4e88b3061 100644
--- a/frame/staking/src/mock.rs
+++ b/frame/staking/src/mock.rs
@@ -1,10 +1,6 @@
 //! Test utilities
 
-use std::{
-	cell::RefCell,
-	collections::HashSet,
-	time::{SystemTime, UNIX_EPOCH},
-};
+use std::{cell::RefCell, collections::HashSet};
 
 use frame_support::{
 	assert_ok, impl_outer_origin, parameter_types,
@@ -28,7 +24,7 @@ use crate::*;
 
 pub type AccountId = u64;
 pub type BlockNumber = u64;
-pub type Balance = u64;
+pub type Balance = u128;
 
 pub type System = system::Module<Test>;
 pub type Session = pallet_session::Module<Test>;
@@ -43,7 +39,8 @@ pub const MICRO: Balance = 1_000 * NANO;
 pub const MILLI: Balance = 1_000 * MICRO;
 pub const COIN: Balance = 1_000 * MILLI;
 
-pub const CAP: Balance = 1_000_000_000 * COIN;
+pub const CAP: Balance = 10_000_000_000 * COIN;
+pub const GENESIS_TIME: Moment = 0;
 pub const TOTAL_POWER: Power = 1_000_000_000;
 
 thread_local! {
@@ -203,7 +200,7 @@ parameter_types! {
 
 	pub const Cap: Balance = CAP;
 	pub const TotalPower: Power = TOTAL_POWER;
-	pub const GenesisTime: Moment = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_millis() as _;
+	pub const GenesisTime: Moment = GENESIS_TIME;
 }
 impl Trait for Test {
 	type Time = pallet_timestamp::Module<Self>;
diff --git a/frame/staking/src/tests.rs b/frame/staking/src/tests.rs
index 8c3c380a8..a4bb3b4f7 100644
--- a/frame/staking/src/tests.rs
+++ b/frame/staking/src/tests.rs
@@ -1,5 +1,7 @@
 //! Tests for the module.
 
+use substrate_test_utils::assert_eq_uvec;
+
 use crate::{mock::*, *};
 
 // #[test]
@@ -1771,30 +1773,30 @@ use crate::{mock::*, *};
 // 			check_nominator_all();
 // 		})
 // }
-//
-// #[test]
-// fn phragmen_should_not_overflow_validators() {
-// 	ExtBuilder::default().nominate(false).build().execute_with(|| {
-// 		let _ = Staking::chill(Origin::signed(10));
-// 		let _ = Staking::chill(Origin::signed(20));
-//
-// 		bond_validator(2, u64::max_value());
-// 		bond_validator(4, u64::max_value());
-//
-// 		bond_nominator(6, u64::max_value() / 2, vec![3, 5]);
-// 		bond_nominator(8, u64::max_value() / 2, vec![3, 5]);
-//
-// 		start_era(1);
-//
-// 		assert_eq_uvec!(validator_controllers(), vec![4, 2]);
-//
-// 		// This test will fail this. Will saturate.
-// 		// check_exposure_all();
-// 		assert_eq!(Staking::stakers(3).total, u64::max_value());
-// 		assert_eq!(Staking::stakers(5).total, u64::max_value());
-// 	})
-// }
-//
+
+#[test]
+fn phragmen_should_not_overflow_validators() {
+	ExtBuilder::default().nominate(false).build().execute_with(|| {
+		let _ = Staking::chill(Origin::signed(10));
+		let _ = Staking::chill(Origin::signed(20));
+
+		bond_validator(2, StakingBalance::RingBalance(CAP - 1));
+		bond_validator(4, StakingBalance::KtonBalance(CAP - 1));
+
+		bond_nominator(6, StakingBalance::RingBalance(1), vec![3, 5]);
+		bond_nominator(8, StakingBalance::KtonBalance(1), vec![3, 5]);
+
+		start_era(1);
+
+		assert_eq_uvec!(validator_controllers(), vec![4, 2]);
+
+		// This test will fail this. Will saturate.
+		// check_exposure_all();
+		assert_eq!(Staking::stakers(3).total_power, TOTAL_POWER / 2);
+		assert_eq!(Staking::stakers(5).total_power, TOTAL_POWER / 2);
+	})
+}
+
 // #[test]
 // fn phragmen_should_not_overflow_nominators() {
 // 	ExtBuilder::default().nominate(false).build().execute_with(|| {
diff --git a/frame/support/src/lib.rs b/frame/support/src/lib.rs
index 8fec80ee9..4a000204f 100644
--- a/frame/support/src/lib.rs
+++ b/frame/support/src/lib.rs
@@ -193,8 +193,8 @@ pub mod structs {
 				Ordering::Less
 			} else {
 				// Don't even compute gcd.
-				let self_n = self.0 as u64 * other.1 as u64;
-				let other_n = other.0 as u64 * self.1 as u64;
+				let self_n = self.0 as u128 * other.1 as u128;
+				let other_n = other.0 as u128 * self.1 as u128;
 				self_n.cmp(&other_n)
 			}
 		}
@@ -206,8 +206,8 @@ pub mod structs {
 			if self.1 == other.1 {
 				self.0.eq(&other.0)
 			} else {
-				let self_n = self.0 as u64 * other.1 as u64;
-				let other_n = other.0 as u64 * self.1 as u64;
+				let self_n = self.0 as u128 * other.1 as u128;
+				let other_n = other.0 as u128 * self.1 as u128;
 				self_n.eq(&other_n)
 			}
 		}