diff --git a/packages/next/lib/is-error.ts b/packages/next/lib/is-error.ts
index 4560fa7e928e938..31ba3e4a47a5de7 100644
--- a/packages/next/lib/is-error.ts
+++ b/packages/next/lib/is-error.ts
@@ -1,4 +1,4 @@
-import { isPlainObject } from './is-plain-object'
+import { isPlainObject } from '../shared/lib/is-plain-object'
 
 // We allow some additional attached properties for Errors
 export interface NextError extends Error {
diff --git a/packages/next/lib/is-serializable-props.ts b/packages/next/lib/is-serializable-props.ts
index 1202d4d98882d2d..e42407efc85f4fa 100644
--- a/packages/next/lib/is-serializable-props.ts
+++ b/packages/next/lib/is-serializable-props.ts
@@ -1,4 +1,7 @@
-import { isPlainObject, getObjectClassLabel } from './is-plain-object'
+import {
+  isPlainObject,
+  getObjectClassLabel,
+} from '../shared/lib/is-plain-object'
 
 const regexpPlainIdentifier = /^[A-Za-z_$][A-Za-z0-9_$]*$/
 
diff --git a/packages/next/lib/is-plain-object.ts b/packages/next/shared/lib/is-plain-object.ts
similarity index 100%
rename from packages/next/lib/is-plain-object.ts
rename to packages/next/shared/lib/is-plain-object.ts