diff --git a/config/fixturenet-optimism/l1-params.env b/config/fixturenet-optimism/l1-params.env
index ae3b03b..e5a13bb 100644
--- a/config/fixturenet-optimism/l1-params.env
+++ b/config/fixturenet-optimism/l1-params.env
@@ -12,3 +12,4 @@ DEFAULT_CERC_L1_PORT=8545
 DEFAULT_CERC_L1_ACCOUNTS_CSV_URL="http://fixturenet-eth-bootnode-geth:9898/accounts.csv"
 DEFAULT_CERC_L2_PROPOSER_AMOUNT="0.2ether"
 DEFAULT_CERC_L2_BATCHER_AMOUNT="0.1ether"
+DEFAULT_CERC_L1_BEACON=http://fixturenet-eth-lighthouse-1:8001
\ No newline at end of file
diff --git a/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh b/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
index d2fb9e1..c524de7 100755
--- a/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
+++ b/config/fixturenet-optimism/optimism-contracts/deploy-contracts.sh
@@ -19,7 +19,7 @@ export IMPL_SALT=$(openssl rand -hex 32)
 echo "Using L1 RPC endpoint ${CERC_L1_RPC}"
 
 # Exit if a deployment already exists (on restarts)
-if [ -d "/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json" ]; then
+if [ -f "/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json" ]; then
   echo "Deployment directory /l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json, checking OptimismPortal deployment"
 
   OPTIMISM_PORTAL_ADDRESS=$(cat /l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json | jq -r .OptimismPortal)
diff --git a/config/fixturenet-optimism/run-op-node.sh b/config/fixturenet-optimism/run-op-node.sh
index 005c7e1..34d8e09 100755
--- a/config/fixturenet-optimism/run-op-node.sh
+++ b/config/fixturenet-optimism/run-op-node.sh
@@ -7,6 +7,7 @@ fi
 CERC_L1_CHAIN_ID="${CERC_L1_CHAIN_ID:-${DEFAULT_CERC_L1_CHAIN_ID}}"
 CERC_L1_RPC="${CERC_L1_RPC:-${DEFAULT_CERC_L1_RPC}}"
 DEPLOYMENT_CONTEXT="$CERC_L1_CHAIN_ID"
+CERC_L1_BEACON="${CERC_L1_BEACON:-${DEFAULT_CERC_L1_BEACON}}"
 
 deploy_config_file="/l2-config/$DEPLOYMENT_CONTEXT.json"
 l1_deployment_file="/l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json"
@@ -34,4 +35,4 @@ op-node \
   --p2p.sequencer.key="${SEQ_KEY#0x}" \
   --l1=$CERC_L1_RPC \
   --l1.rpckind=$RPC_KIND \
-  --l1.beacon=http://fixturenet-eth-lighthouse-1:8001
+  --l1.beacon=$CERC_L1_BEACON