diff --git a/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G1MultiExpPrecompile.cs b/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G1MultiExpPrecompile.cs
index e9b42311eb9..b8e821b6023 100644
--- a/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G1MultiExpPrecompile.cs
+++ b/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G1MultiExpPrecompile.cs
@@ -42,7 +42,7 @@ public long BaseGasCost(IReleaseSpec releaseSpec)
 
         public long DataGasCost(byte[] inputData, IReleaseSpec releaseSpec)
         {
-            int k = inputData.Length / 192;
+            int k = inputData.Length / ItemSize;
             return 12000L * k * Discount.For(k) / 1000;
         }
 
diff --git a/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G2MultiExpPrecompile.cs b/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G2MultiExpPrecompile.cs
index 9f1b83b74b4..e9d0e2a4646 100644
--- a/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G2MultiExpPrecompile.cs
+++ b/src/Nethermind/Nethermind.Evm/Precompiles/Bls/Shamatar/G2MultiExpPrecompile.cs
@@ -42,7 +42,7 @@ public long BaseGasCost(IReleaseSpec releaseSpec)
 
         public long DataGasCost(byte[] inputData, IReleaseSpec releaseSpec)
         {
-            int k = inputData.Length / 288;
+            int k = inputData.Length / ItemSize;
             return 55000L * k * Discount.For(k) / 1000;;
         }