diff --git a/examples/persistance-agent/index.ts b/examples/persistance-agent/index.ts
index d679829..21badd0 100644
--- a/examples/persistance-agent/index.ts
+++ b/examples/persistance-agent/index.ts
@@ -14,7 +14,7 @@ const checkpointer = PostgresSaver.fromConnString(
 
 function validateEnvironment(): void {
     const missingVars: string[] = [];
-    const requiredVars = ["OPENAI_API_KEY", "RPC_URL", "SOLANA_PRIVATE_KEY"];
+    const requiredVars = ["OPENAI_API_KEY", "RPC_URL", "SOLANA_PRIVATE_KEY", "POSTGRES_DB_URL"];
 
     requiredVars.forEach((varName) => {
         if (!process.env[varName]) {