diff --git a/packages/x-data-grid/src/components/panel/filterPanel/GridFilterForm.tsx b/packages/x-data-grid/src/components/panel/filterPanel/GridFilterForm.tsx
index c30e5af630d0..7b77c926b43a 100644
--- a/packages/x-data-grid/src/components/panel/filterPanel/GridFilterForm.tsx
+++ b/packages/x-data-grid/src/components/panel/filterPanel/GridFilterForm.tsx
@@ -180,7 +180,7 @@ const FilterFormOperatorInput = styled('div', {
   name: 'MuiDataGrid',
   slot: 'FilterFormOperatorInput',
   overridesResolver: (_, styles) => styles.filterFormOperatorInput,
-})<{ ownerState: OwnerState }>({ width: 120 });
+})<{ ownerState: OwnerState }>({ width: 150 });
 
 const FilterFormValueInput = styled('div', {
   name: 'MuiDataGrid',