diff --git a/src/renderers/contentful-fields-only/fields/renderLink.ts b/src/renderers/contentful-fields-only/fields/renderLink.ts
index 978d1fdb..967fbc9e 100644
--- a/src/renderers/contentful-fields-only/fields/renderLink.ts
+++ b/src/renderers/contentful-fields-only/fields/renderLink.ts
@@ -11,7 +11,10 @@ export default function renderLink(field: Field): string {
     const contentTypeValidation = field.validations.find(validation => !!validation.linkContentType)
 
     if (contentTypeValidation) {
-      return renderUnionValues(contentTypeValidation.linkContentType!.map(renderContentTypeId))
+      return renderUnionValues([
+        ...contentTypeValidation.linkContentType!.map(renderContentTypeId),
+        "undefined",
+      ])
     } else {
       return "unknown"
     }
diff --git a/src/renderers/contentful/fields/renderLink.ts b/src/renderers/contentful/fields/renderLink.ts
index 5e911025..4b69e6d7 100644
--- a/src/renderers/contentful/fields/renderLink.ts
+++ b/src/renderers/contentful/fields/renderLink.ts
@@ -11,7 +11,10 @@ export default function renderLink(field: Field): string {
     const contentTypeValidation = field.validations.find(validation => !!validation.linkContentType)
 
     if (contentTypeValidation) {
-      return renderUnionValues(contentTypeValidation.linkContentType!.map(renderContentTypeId))
+      return renderUnionValues([
+        ...contentTypeValidation.linkContentType!.map(renderContentTypeId),
+        "undefined",
+      ])
     } else {
       return "Entry<{ [fieldId: string]: unknown }>"
     }
diff --git a/test/renderers/contentful-fields-only/fields/renderArray.test.ts b/test/renderers/contentful-fields-only/fields/renderArray.test.ts
index 1f849b06..14ec4f57 100644
--- a/test/renderers/contentful-fields-only/fields/renderArray.test.ts
+++ b/test/renderers/contentful-fields-only/fields/renderArray.test.ts
@@ -63,7 +63,7 @@ describe("renderArray()", () => {
     }
 
     expect(renderArray(arrayOfValidatedSymbols)).toMatchInlineSnapshot(
-      `"(IContentType1 | IContentType2)[]"`,
+      `"(IContentType1 | IContentType2 | undefined)[]"`,
     )
   })
 })
diff --git a/test/renderers/contentful-fields-only/fields/renderLink.test.ts b/test/renderers/contentful-fields-only/fields/renderLink.test.ts
index d4edd72d..94187387 100644
--- a/test/renderers/contentful-fields-only/fields/renderLink.test.ts
+++ b/test/renderers/contentful-fields-only/fields/renderLink.test.ts
@@ -31,7 +31,7 @@ describe("renderLink()", () => {
       linkType: "Entry",
     }
 
-    expect(renderLink(validatedEntryLink)).toMatchInlineSnapshot(`"ILinkToOtherThing"`)
+    expect(renderLink(validatedEntryLink)).toMatchInlineSnapshot(`"ILinkToOtherThing | undefined"`)
   })
 
   it("renders an asset link", () => {
diff --git a/test/renderers/contentful/fields/renderArray.test.ts b/test/renderers/contentful/fields/renderArray.test.ts
index 80039aae..490fed3b 100644
--- a/test/renderers/contentful/fields/renderArray.test.ts
+++ b/test/renderers/contentful/fields/renderArray.test.ts
@@ -63,7 +63,7 @@ describe("renderArray()", () => {
     }
 
     expect(renderArray(arrayOfValidatedSymbols)).toMatchInlineSnapshot(
-      `"(IContentType1 | IContentType2)[]"`,
+      `"(IContentType1 | IContentType2 | undefined)[]"`,
     )
   })
 })
diff --git a/test/renderers/contentful/fields/renderLink.test.ts b/test/renderers/contentful/fields/renderLink.test.ts
index 883ae0ad..ed8e1d9d 100644
--- a/test/renderers/contentful/fields/renderLink.test.ts
+++ b/test/renderers/contentful/fields/renderLink.test.ts
@@ -33,7 +33,7 @@ describe("renderLink()", () => {
       linkType: "Entry",
     }
 
-    expect(renderLink(validatedEntryLink)).toMatchInlineSnapshot(`"ILinkToOtherThing"`)
+    expect(renderLink(validatedEntryLink)).toMatchInlineSnapshot(`"ILinkToOtherThing | undefined"`)
   })
 
   it("renders an asset link", () => {