diff --git a/packages/worker/src/environment.ts b/packages/worker/src/environment.ts
index f4c339ad6d..37d40a2a9c 100644
--- a/packages/worker/src/environment.ts
+++ b/packages/worker/src/environment.ts
@@ -89,7 +89,7 @@ for (let [key, value] of Object.entries(environment)) {
   // handle the edge case of "0" to disable an environment variable
   if (value === "0") {
     // @ts-ignore
-    env[key] = 0
+    environment[key] = 0
   }
 }