diff --git a/.changeset/fix-postgres-18-volume-mount.md b/.changeset/fix-postgres-18-volume-mount.md
new file mode 100644
index 0000000000..3a268a17a0
--- /dev/null
+++ b/.changeset/fix-postgres-18-volume-mount.md
@@ -0,0 +1,5 @@
+---
+'electric-ax': patch
+---
+
+Fix postgres 18 docker volume mount path to use `/var/lib/postgresql` instead of `/var/lib/postgresql/data`
diff --git a/packages/agents-server/docker-compose.full.yml b/packages/agents-server/docker-compose.full.yml
index 30ca67f03a..478929af22 100644
--- a/packages/agents-server/docker-compose.full.yml
+++ b/packages/agents-server/docker-compose.full.yml
@@ -24,7 +24,7 @@ services:
       timeout: 5s
       retries: 30
     volumes:
-      - electric-agents-postgres-data:/var/lib/postgresql/data
+      - electric-agents-postgres-data:/var/lib/postgresql
 
   electric:
     image: electricsql/electric:latest
diff --git a/packages/electric-ax/docker-compose.full.yml b/packages/electric-ax/docker-compose.full.yml
index cabb1692ae..0ffafa59b9 100644
--- a/packages/electric-ax/docker-compose.full.yml
+++ b/packages/electric-ax/docker-compose.full.yml
@@ -24,7 +24,7 @@ services:
       timeout: 5s
       retries: 30
     volumes:
-      - electric-agents-postgres-data:/var/lib/postgresql/data
+      - electric-agents-postgres-data:/var/lib/postgresql
 
   electric:
     image: electricsql/electric:latest