diff --git a/packages/histoire-shared/src/types/config.ts b/packages/histoire-shared/src/types/config.ts
index 132ea6b1..dc674370 100644
--- a/packages/histoire-shared/src/types/config.ts
+++ b/packages/histoire-shared/src/types/config.ts
@@ -19,7 +19,7 @@ export type GrayColorKeys = ColorKeys | '750' | '850' | '950'
 export interface ResponsivePreset {
   label: string
   width: number
-  height: number
+  height?: number
 }
 
 export interface BackgroundPreset {