diff --git a/components/grid/nz-col.directive.ts b/components/grid/nz-col.directive.ts
index d8a4e66bfb9..d109612f580 100644
--- a/components/grid/nz-col.directive.ts
+++ b/components/grid/nz-col.directive.ts
@@ -24,11 +24,11 @@ import { startWith, takeUntil } from 'rxjs/operators';
 import { NzRowDirective } from './nz-row.directive';
 
 export interface EmbeddedProperty {
-  span: number;
-  pull: number;
-  push: number;
-  offset: number;
-  order: number;
+  span?: number;
+  pull?: number;
+  push?: number;
+  offset?: number;
+  order?: number;
 }
 
 @Directive({