diff --git a/frame/nomination-pools/src/lib.rs b/frame/nomination-pools/src/lib.rs
index b5e605e26f555..e7f205f724a47 100644
--- a/frame/nomination-pools/src/lib.rs
+++ b/frame/nomination-pools/src/lib.rs
@@ -1953,14 +1953,15 @@ impl<T: Config> Pallet<T> {
 		current_points: BalanceOf<T>,
 		points: BalanceOf<T>,
 	) -> BalanceOf<T> {
+		let u256 = |x| T::BalanceToU256::convert(x);
+		let balance = |x| T::U256ToBalance::convert(x);
 		if current_balance.is_zero() || current_points.is_zero() || points.is_zero() {
 			// There is nothing to unbond
 			return Zero::zero()
 		}
 
 		// Equivalent of (current_balance / current_points) * points
-		current_balance
-			.saturating_mul(points)
+		balance(u256(current_balance).saturating_mul(u256(points)))
 			// We check for zero above
 			.div(current_points)
 	}
diff --git a/frame/nomination-pools/src/tests.rs b/frame/nomination-pools/src/tests.rs
index 350bc97295f23..15beb0572b9e1 100644
--- a/frame/nomination-pools/src/tests.rs
+++ b/frame/nomination-pools/src/tests.rs
@@ -1828,9 +1828,9 @@ mod unbond {
 		})
 	}
 
+	// depositor can unbond inly up to `MinCreateBond`.
 	#[test]
 	fn depositor_permissioned_partial_unbond() {
-		// Scenarios where non-admin accounts can unbond others
 		ExtBuilder::default()
 			.ed(1)
 			.add_delegators(vec![(100, 100)])
@@ -1852,6 +1852,29 @@ mod unbond {
 				);
 			});
 	}
+
+	// same as above, but the pool is slashed and therefore the depositor cannot partially unbond.
+	#[test]
+	fn depositor_permissioned_partial_unbond_slashed() {
+		ExtBuilder::default()
+			.ed(1)
+			.add_delegators(vec![(100, 100)])
+			.build_and_execute(|| {
+				// given
+				assert_eq!(MinCreateBond::<Runtime>::get(), 2);
+				assert_eq!(Delegators::<Runtime>::get(10).unwrap().active_points(), 10);
+				assert_eq!(Delegators::<Runtime>::get(10).unwrap().unbonding_points(), 0);
+
+				// slash the default pool
+				StakingMock::set_bonded_balance(Pools::create_bonded_account(1), 5);
+
+				// cannot unbond even 7, because the value of shares is now less.
+				assert_noop!(
+					Pools::unbond(Origin::signed(10), 10, 7),
+					Error::<Runtime>::NotOnlyDelegator
+				);
+			});
+	}
 }
 
 mod pool_withdraw_unbonded {