diff --git a/handsontable/handsontable-tests.ts b/handsontable/handsontable-tests.ts
index d062f9c629..6d55abd960 100644
--- a/handsontable/handsontable-tests.ts
+++ b/handsontable/handsontable-tests.ts
@@ -267,6 +267,7 @@ function test_HandsontableMethods() {
   hot.loadData([]);
   hot.populateFromArray(123, 123, [], 123, 123, 'foo', 'foo', 'foo', []);
   hot.propToCol('foo');
+  hot.propToCol(123);
   hot.removeCellMeta(123, 123, 'foo');
   hot.removeHook('foo', function() {});
   hot.render();
diff --git a/handsontable/index.d.ts b/handsontable/index.d.ts
index 7a82509baa..c08470739e 100644
--- a/handsontable/index.d.ts
+++ b/handsontable/index.d.ts
@@ -266,7 +266,7 @@ declare namespace ht {
     listen(): void;
     loadData(data: any[]): void;
     populateFromArray(row: number, col: number, input: any[], endRow?: number, endCol?: number, source?: string, method?: string, direction?: string, deltas?: any[]): any;
-    propToCol(prop: string): number;
+    propToCol(prop: string | number): number;
     removeCellMeta(row: number, col: number, key: string): void;
     removeHook(key: string, callback: Function): void;
     render(): void;