diff --git a/aztec-up/bin/aztec b/aztec-up/bin/aztec
index 864d862bcbd8..e870a387e03d 100755
--- a/aztec-up/bin/aztec
+++ b/aztec-up/bin/aztec
@@ -65,8 +65,6 @@ case ${1:-} in
       # We should not have to provide a binary path and working dir.
       # Why is this not just determined and chosen at runtime?
       # In fact almost none of these should not have to be set if we have sensible defaults.
-      export BB_BINARY_PATH=/usr/src/barretenberg/cpp/build/bin/bb
-      export BB_WORKING_DIRECTORY=/tmp/bb
       export L1_CHAIN_ID=31337
       export ARCHIVER_POLLING_INTERVAL_MS=500
       export P2P_BLOCK_CHECK_INTERVAL_MS=500
@@ -75,6 +73,8 @@ case ${1:-} in
       export ARCHIVER_VIEM_POLLING_INTERVAL_MS=500
       export TEST_ACCOUNTS=${TEST_ACCOUNTS:-true}
       export LOG_LEVEL=${LOG_LEVEL:-info}
+      export DEPLOY_AZTEC_CONTRACTS_SALT=${DEPLOY_AZTEC_CONTRACTS_SALT:-$RANDOM}
+
 
       ANVIL_PORT=${ANVIL_PORT:-8545}
       anvil_port_assignment="$ANVIL_PORT:8545"