diff --git a/packages/mermaid/src/config.type.ts b/packages/mermaid/src/config.type.ts
index 2914a4606..0ba317868 100644
--- a/packages/mermaid/src/config.type.ts
+++ b/packages/mermaid/src/config.type.ts
@@ -1281,11 +1281,6 @@ export interface GanttDiagramConfig extends BaseDiagramConfig {
    *
    */
   weekday?: 'monday' | 'tuesday' | 'wednesday' | 'thursday' | 'friday' | 'saturday' | 'sunday';
-  /**
-   * On which day a weekend interval should start
-   *
-   */
-  weekend?: 'friday' | 'saturday';
 }
 /**
  * The object containing configurations specific for sequence diagrams