diff --git a/code/addons/docs/src/blocks/components/ArgsTable/types.ts b/code/addons/docs/src/blocks/components/ArgsTable/types.ts
index c81327d82215..dcd32fbf98c6 100644
--- a/code/addons/docs/src/blocks/components/ArgsTable/types.ts
+++ b/code/addons/docs/src/blocks/components/ArgsTable/types.ts
@@ -22,7 +22,7 @@ export interface JsDocTags {
 
 export interface PropSummaryValue {
   summary: string;
-  detail?: string;
+  detail?: string | undefined;
   required?: boolean;
 }
 
diff --git a/code/core/src/csf/story.ts b/code/core/src/csf/story.ts
index 0a128a1670a2..6ff038936383 100644
--- a/code/core/src/csf/story.ts
+++ b/code/core/src/csf/story.ts
@@ -126,13 +126,13 @@ export interface InputType {
     /** @see https://storybook.js.org/docs/api/arg-types#tablecategory */
     category?: string;
     /** @see https://storybook.js.org/docs/api/arg-types#tabledefaultvalue */
-    defaultValue?: { summary?: string; detail?: string };
+    defaultValue?: { summary?: string | undefined; detail?: string | undefined };
     /** @see https://storybook.js.org/docs/api/arg-types#tabledisable */
     disable?: boolean;
     /** @see https://storybook.js.org/docs/api/arg-types#tablesubcategory */
     subcategory?: string;
     /** @see https://storybook.js.org/docs/api/arg-types#tabletype */
-    type?: { summary?: string; detail?: string };
+    type?: { summary?: string | undefined; detail?: string | undefined };
   };
   /** @see https://storybook.js.org/docs/api/arg-types#type */
   type?: SBType | SBScalarType['name'];
diff --git a/code/core/src/docs-tools/argTypes/docgen/PropDef.ts b/code/core/src/docs-tools/argTypes/docgen/PropDef.ts
index 7fcbae1ae466..7c4613debe4a 100644
--- a/code/core/src/docs-tools/argTypes/docgen/PropDef.ts
+++ b/code/core/src/docs-tools/argTypes/docgen/PropDef.ts
@@ -15,8 +15,8 @@ export interface JsDocTags {
 }
 
 export interface PropSummaryValue {
-  summary?: string;
-  detail?: string;
+  summary?: string | undefined;
+  detail?: string | undefined;
 }
 
 export type PropType = PropSummaryValue;