diff --git a/bin/build.sh b/bin/build.sh
index 3ffb85c..fbeae1b 100755
--- a/bin/build.sh
+++ b/bin/build.sh
@@ -2,7 +2,7 @@
 # this script requires the jq command $(sudo apt install jq)
 
 # first-pass build
-forge build "$@" || exit 1
+forge build --force "$@" || exit 1
 
 # calculate the Vault init code hash using the bytecode generated for Vault
 # shellcheck disable=SC2046
diff --git a/src/OrderLib.sol b/src/OrderLib.sol
index d783a69..28858bb 100644
--- a/src/OrderLib.sol
+++ b/src/OrderLib.sol
@@ -109,7 +109,7 @@ library OrderLib {
     }
 
     struct Tranche {
-        uint64 fraction; // 18-decimal fraction of the order amount which is available to this tranche. must be <= 1
+        uint16 fraction; // fraction of the order amount is available to this tranche, where type(uint16).max == 100%
         Constraint[] constraints;
     }
 
@@ -239,7 +239,7 @@ library OrderLib {
                 return 'NI'; // not implemented
             // unknown constraint
         }
-        uint256 amount = status.order.amount * tranche.fraction / 10 ** 18 // the most this tranche could do
+        uint256 amount = status.order.amount * tranche.fraction / type(uint16).max // the most this tranche could do
                          - (status.order.amountIsInput ? status.trancheFilledIn[tranche_index] : status.trancheFilledOut[tranche_index]); // minus tranche fills
         // order amount remaining
         uint256 remaining = status.order.amount - (status.order.amountIsInput ? status.filledIn : status.filledOut);
diff --git a/src/VaultAddress.sol b/src/VaultAddress.sol
index f0c5954..66426bc 100644
--- a/src/VaultAddress.sol
+++ b/src/VaultAddress.sol
@@ -10,7 +10,7 @@ library VaultAddress {
     // keccak-256 hash of the Vault's bytecode (not the deployed bytecode but the initialization bytecode)
     // can paste into:
     // https://emn178.github.io/online-tools/keccak_256.html
-    bytes32 internal constant VAULT_INIT_CODE_HASH = 0xe5ccc5781ec7c9aa6e1ca21f73022e0b4606f22aca8dde4e455fd8051007d378;
+    bytes32 internal constant VAULT_INIT_CODE_HASH = 0x304b4fd55dc4ea606dcf1e4085f81f376e30552a319aa43fc3e389a089f2f0ea;
 
     // the contract being constructed must not have any constructor arguments or the determinism will be broken.  instead, use a callback to
     // get construction arguments