diff --git a/src/dictionary.ts b/src/dictionary.ts
index dbb377c..cc8e1d2 100644
--- a/src/dictionary.ts
+++ b/src/dictionary.ts
@@ -1,14 +1,13 @@
 import { objectRuntype } from './object'
 import {
   createFail,
-  setupInternalRuntype,
+  InternalRuntypeOf,
   isFail,
   propagateFail,
-  getInternalRuntype,
-  InternalRuntypeOf,
+  setupInternalRuntype,
 } from './runtype'
+import type { Runtype } from './runtype'
 import { debugValue } from './runtypeError'
-import type { Runtype, InternalRuntype, Fail } from './runtype'
 
 const internalObjectRuntype: InternalRuntypeOf<typeof objectRuntype> = objectRuntype
 
diff --git a/src/record.ts b/src/record.ts
index 3cf89ca..1012dce 100644
--- a/src/record.ts
+++ b/src/record.ts
@@ -58,7 +58,7 @@ export function internalRecord(
         // checked at all
         // this is vital to preserve the object shape of an impure record
         // with optional fields
-        if (t.meta?.optional && !o.hasOwnProperty(k)) {
+        if (t.meta?.optional && !Object.prototype.hasOwnProperty.call(o, k)) {
           break
         }