diff --git a/contracts/sfc/ConstantsManager.sol b/contracts/sfc/ConstantsManager.sol
index 8c35e2a..a2a1676 100644
--- a/contracts/sfc/ConstantsManager.sol
+++ b/contracts/sfc/ConstantsManager.sol
@@ -54,10 +54,10 @@ contract ConstantsManager is Ownable {
     constructor(address owner) Ownable(owner) {}
 
     function updateMinSelfStake(uint256 v) external virtual onlyOwner {
-        if (v < 100000 * 1e18) {
+        if (v < 100000 * Decimal.unit()) {
             revert ValueTooSmall();
         }
-        if (v > 10000000 * 1e18) {
+        if (v > 10000000 * Decimal.unit()) {
             revert ValueTooLarge();
         }
         minSelfStake = v;
@@ -115,10 +115,10 @@ contract ConstantsManager is Ownable {
     }
 
     function updateBaseRewardPerSecond(uint256 v) external virtual onlyOwner {
-        if (v < 0.5 * 1e18) {
+        if (v < Decimal.unit() / 2) {
             revert ValueTooSmall();
         }
-        if (v > 32 * 1e18) {
+        if (v > 32 * Decimal.unit()) {
             revert ValueTooLarge();
         }
         baseRewardPerSecond = v;
diff --git a/contracts/sfc/NetworkInitializer.sol b/contracts/sfc/NetworkInitializer.sol
index 15c7378..a738276 100644
--- a/contracts/sfc/NetworkInitializer.sol
+++ b/contracts/sfc/NetworkInitializer.sol
@@ -25,7 +25,7 @@ contract NetworkInitializer {
         NodeDriverAuth(_auth).initialize(_sfc, _driver, _owner);
 
         ConstantsManager consts = new ConstantsManager(address(this));
-        consts.updateMinSelfStake(500000 * 1e18);
+        consts.updateMinSelfStake(500000 * Decimal.unit());
         consts.updateMaxDelegatedRatio(16 * Decimal.unit());
         consts.updateValidatorCommission((15 * Decimal.unit()) / 100);
         consts.updateBurntFeeShare((20 * Decimal.unit()) / 100);
diff --git a/contracts/test/UnitTestSFC.sol b/contracts/test/UnitTestSFC.sol
index 5c40c05..112a2d4 100644
--- a/contracts/test/UnitTestSFC.sol
+++ b/contracts/test/UnitTestSFC.sol
@@ -66,7 +66,7 @@ contract UnitTestNetworkInitializer {
         NodeDriverAuth(_auth).initialize(_sfc, _driver, _owner);
 
         UnitTestConstantsManager consts = new UnitTestConstantsManager(address(this));
-        consts.updateMinSelfStake(0.3175000 * 1e18);
+        consts.updateMinSelfStake((3175 * Decimal.unit()) / 10000);
         consts.updateMaxDelegatedRatio(16 * Decimal.unit());
         consts.updateValidatorCommission((15 * Decimal.unit()) / 100);
         consts.updateBurntFeeShare((20 * Decimal.unit()) / 100);