diff --git a/ui-grid/ui-grid.d.ts b/ui-grid/ui-grid.d.ts
index 896a2d60e2..981f363b21 100644
--- a/ui-grid/ui-grid.d.ts
+++ b/ui-grid/ui-grid.d.ts
@@ -192,7 +192,7 @@ declare module uiGrid {
     export interface IGridOptions {
         aggregationCalcThrottle?: number;
         appScopeProvider?: ng.IScope | Object;
-        columnDefs?: IColumnDef;
+        columnDefs?: Array<IColumnDef>;
         columnFooterHeight?: number;
         columnVirtualizationThreshold?: number;
         data?: Array<any> | string;