diff --git a/types/isotope-layout/index.d.ts b/types/isotope-layout/index.d.ts
index 5e1f0623e4..66d4a21d52 100644
--- a/types/isotope-layout/index.d.ts
+++ b/types/isotope-layout/index.d.ts
@@ -2,6 +2,7 @@
 // Project: http://isotope.metafizzy.co/
 // Definitions by: Anže Videnič <https://github.com/avidenic>
 //                 Mălin Brândușe <https://github.com/malinushj>
+//                 SPWizard01 <https://github.com/SPWizard01>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -30,7 +31,7 @@ declare namespace Isotope {
          * If set to a string, that value is used as a selector.
          * If filter is set to a function, that function checks each item and returns true or false if the item should be shown or hidden.
          */
-        filter?: string | (() => boolean);
+        filter?: string | ((itemElement: HTMLElement) => boolean);
         /**
          * Items are arranged into rows. Rows progress vertically. Similar to what you would expect from a layout that uses CSS floats. fitRows works well for items that have the same height.
          */
diff --git a/types/isotope-layout/isotope-layout-tests.ts b/types/isotope-layout/isotope-layout-tests.ts
index 776412b2c2..d37475cefa 100644
--- a/types/isotope-layout/isotope-layout-tests.ts
+++ b/types/isotope-layout/isotope-layout-tests.ts
@@ -70,8 +70,8 @@ let $grid = $('.grid').isotope({
 
 // test the ones not used in upper test
 $grid = $('.grid').isotope({
-    filter: (): boolean => {
-        return true;
+    filter: (itemElem): boolean => {
+        return itemElem ? true : false;
     },
     sortAscending: {
         key: true