diff --git a/packages/workflow-agent-claude-code/src/claude-code.ts b/packages/workflow-agent-claude-code/src/claude-code.ts
index 964261d..5d8c73f 100644
--- a/packages/workflow-agent-claude-code/src/claude-code.ts
+++ b/packages/workflow-agent-claude-code/src/claude-code.ts
@@ -16,7 +16,7 @@ const log = createLogger({ sink: { kind: "stderr" } });
 
 const CLAUDE_COMMAND = "claude";
 const CLAUDE_MAX_TURNS = 90;
-const CLAUDE_MODEL = process.env["CLAUDE_MODEL"] ?? null;
+const CLAUDE_MODEL = process.env.CLAUDE_MODEL ?? null;
 
 function buildHistorySummary(steps: AgentContext["steps"]): string {
   if (steps.length === 0) {