diff --git a/packages/x-data-grid/src/hooks/features/columnHeaders/useGridColumnHeaders.tsx b/packages/x-data-grid/src/hooks/features/columnHeaders/useGridColumnHeaders.tsx
index ee5325a7ad5b..d72882be1754 100644
--- a/packages/x-data-grid/src/hooks/features/columnHeaders/useGridColumnHeaders.tsx
+++ b/packages/x-data-grid/src/hooks/features/columnHeaders/useGridColumnHeaders.tsx
@@ -464,7 +464,7 @@ export const useGridColumnHeaders = (props: UseGridColumnHeadersProps) => {
           pinnedPosition={pinnedPosition}
           style={style}
           indexInSection={indexInSection}
-          sectionLength={rowStructure.length}
+          sectionLength={visibleColumnGroupHeader.length}
           gridHasFiller={gridHasFiller}
         />
       );