diff --git a/lib/generator.js b/lib/generator.js
index b4979c1..6b68744 100644
--- a/lib/generator.js
+++ b/lib/generator.js
@@ -11,16 +11,6 @@ const defaultConnectionString = 'postgres://postgres:postgres@127.0.0.1:5432/pos
 // We extend ServiceGenerator instead of DBGenerator because we
 // do not want to allow users to have their own migrations.
 class PlatformaticPgHooksGenerator extends ServiceGenerator {
-  getDefaultConfig () {
-    const defaultBaseConfig = super.getDefaultConfig()
-    const defaultConfig = {
-      db: {
-        connectionString: null
-      }
-    }
-    return Object.assign({}, defaultBaseConfig, defaultConfig)
-  }
-
   getConfigFieldsDefinitions () {
     const serviceConfigFieldsDefs = super.getConfigFieldsDefinitions()
     return [
@@ -38,11 +28,12 @@ class PlatformaticPgHooksGenerator extends ServiceGenerator {
   async _getConfigFileContents () {
     const baseConfig = await super._getConfigFileContents()
     const packageJson = await this.getStackablePackageJson()
+    const dbUrlEnvVar = this.getEnvVarName('DB_URL')
     const config = {
       $schema: './stackable.schema.json',
       module: packageJson.name,
       db: {
-        connectionString: '{DATABASE_URL}'
+        connectionString: `{${dbUrlEnvVar}}`
       },
       service: undefined
     }
@@ -61,7 +52,7 @@ class PlatformaticPgHooksGenerator extends ServiceGenerator {
     }
 
     this.addEnvVars({
-      DATABASE_URL: this.config.connectionString || defaultConnectionString
+      DB_URL: this.config.connectionString || defaultConnectionString
     }, { overwrite: false })
 
     const packageJson = await this.getStackablePackageJson()