diff --git a/chains.yaml b/chains.yaml
index cbf8bd6..d67b450 100644
--- a/chains.yaml
+++ b/chains.yaml
@@ -155,13 +155,14 @@
   github-organization: ava-labs
   github-repo: avalanchego
   dockerfile: avalanche
-  build-target: |
+  pre-build: |
     startTime="$(sed -n 's|.*"startTime":\([^"]*\),.*|\1|p' genesis/genesis_local.json)"
-    if [ "$(date +%s)" -gt $startTime ]; then
-      sed "s/$startTime/1690862400/g" genesis/genesis_local.json > genesis/genesis_local_tmp.json
+    nowTime="$(date +%s)"
+    if [ $nowTime -gt $startTime ]; then
+      sed "s/$startTime/$nowTime/g" genesis/genesis_local.json > genesis/genesis_local_tmp.json
       mv genesis/genesis_local_tmp.json genesis/genesis_local.json
     fi
-    bash scripts/build.sh
+  build-target: bash scripts/build.sh
   binaries:
     - build/avalanchego