diff --git a/src/components/datatable/DataTable.d.ts b/src/components/datatable/DataTable.d.ts
index 6f98873b9..e44ec581e 100755
--- a/src/components/datatable/DataTable.d.ts
+++ b/src/components/datatable/DataTable.d.ts
@@ -75,7 +75,7 @@ export interface DataTableFilterMeta {
      * Filter keys
      * @see DataTableFilterMetaData
      */
-    [key: string]: DataTableFilterMetaData | DataTableOperatorFilterMetaData;
+    [key: string]: string | DataTableFilterMetaData | DataTableOperatorFilterMetaData;
 }
 
 export interface DataTableSortMeta {
diff --git a/src/components/treetable/TreeTable.d.ts b/src/components/treetable/TreeTable.d.ts
index fce08b39b..7fee48829 100755
--- a/src/components/treetable/TreeTable.d.ts
+++ b/src/components/treetable/TreeTable.d.ts
@@ -55,7 +55,7 @@ export interface TreeTableFilterMeta {
      * Filter keys
      * @see TreeTableFilterMetaData
      */
-    [key: string]: TreeTableFilterMetaData | TreeTableOperatorFilterMetaData;
+    [key: string]: string | TreeTableFilterMetaData | TreeTableOperatorFilterMetaData;
 }
 
 export interface TreeTableSortEvent {