diff --git a/ext/node/polyfills/_process/process.ts b/ext/node/polyfills/_process/process.ts
index 57450a5214..046169b08a 100644
--- a/ext/node/polyfills/_process/process.ts
+++ b/ext/node/polyfills/_process/process.ts
@@ -88,6 +88,10 @@ export const env: InstanceType<ObjectConstructor> & Record<string, string> =
       return true; // success
     },
     has: (_target, prop) => typeof denoEnvGet(String(prop)) === "string",
+    deleteProperty(_target, key) {
+      Deno.env.delete(String(key));
+      return true;
+    },
   });
 
 /**
diff --git a/tests/unit_node/process_test.ts b/tests/unit_node/process_test.ts
index 0ae0c2a7ac..b92be2f3ca 100644
--- a/tests/unit_node/process_test.ts
+++ b/tests/unit_node/process_test.ts
@@ -416,6 +416,9 @@ Deno.test({
     assertEquals(process.env.HELLO, "false");
     process.env.HELLO = "WORLD";
     assertEquals(process.env.HELLO, "WORLD");
+
+    delete process.env.HELLO;
+    assertEquals(process.env.HELLO, undefined);
   },
 });