diff --git a/packages/protocol/contracts/L1/TaikoL1.sol b/packages/protocol/contracts/L1/TaikoL1.sol
index ef7441bd6ab..2e199096adb 100644
--- a/packages/protocol/contracts/L1/TaikoL1.sol
+++ b/packages/protocol/contracts/L1/TaikoL1.sol
@@ -198,7 +198,7 @@ contract TaikoL1 is
     }
 
     function getBlockFee() public view returns (uint256) {
-        (, uint fee, uint deposit) = LibProposing.getBlockFee(
+        (, uint256 fee, uint256 deposit) = LibProposing.getBlockFee(
             state,
             getConfig()
         );
diff --git a/packages/protocol/contracts/L1/libs/LibProposing.sol b/packages/protocol/contracts/L1/libs/LibProposing.sol
index 48d382c2495..eb4a475af32 100644
--- a/packages/protocol/contracts/L1/libs/LibProposing.sol
+++ b/packages/protocol/contracts/L1/libs/LibProposing.sol
@@ -222,7 +222,7 @@ library LibProposing {
         TaikoData.State storage state,
         uint256 commitConfirmations,
         TaikoData.BlockMetadata memory meta
-    ) private {
+    ) private view {
         if (commitConfirmations == 0) {
             return;
         }
diff --git a/packages/protocol/contracts/L1/libs/LibVerifying.sol b/packages/protocol/contracts/L1/libs/LibVerifying.sol
index 31b9be8f2b1..631278a6e0a 100644
--- a/packages/protocol/contracts/L1/libs/LibVerifying.sol
+++ b/packages/protocol/contracts/L1/libs/LibVerifying.sol
@@ -153,7 +153,7 @@ library LibVerifying {
         uint256 tRelBp,
         TkoToken tkoToken
     ) private {
-        uint refund = (target.deposit * (10000 - tRelBp)) / 10000;
+        uint256 refund = (target.deposit * (10000 - tRelBp)) / 10000;
         if (refund > 0 && tkoToken.balanceOf(target.proposer) > 0) {
             // Do not refund proposer with 0 TKO balance.
             tkoToken.mint(target.proposer, refund);
@@ -166,18 +166,18 @@ library LibVerifying {
         uint256 reward,
         TkoToken tkoToken
     ) private {
-        uint start;
-        uint count = fc.provers.length;
+        uint256 start;
+        uint256 count = fc.provers.length;
 
         if (config.enableOracleProver) {
             start = 1;
             count -= 1;
         }
 
-        uint sum = (1 << count) - 1;
-        uint weight = 1 << (count - 1);
+        uint256 sum = (1 << count) - 1;
+        uint256 weight = 1 << (count - 1);
         for (uint i = 0; i < count; ++i) {
-            uint proverReward = (reward * weight) / sum;
+            uint256 proverReward = (reward * weight) / sum;
             if (proverReward == 0) {
                 break;
             }