diff --git a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
index 092dbc8dffe..75dd816e5a2 100644
--- a/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
+++ b/projects/igniteui-angular/src/lib/grids/grid-base.directive.ts
@@ -2321,7 +2321,7 @@ export abstract class IgxGridBaseDirective implements GridType,
         if (value !== this._pinning) {
             this.resetCaches();
         }
-        this._pinning = value;
+        this._pinning = Object.assign({}, this._pinning, value);
     }
 
     /**