diff --git a/packages/core/src/components/CheckboxTree/CheckboxTree.stories.tsx b/packages/core/src/components/CheckboxTree/CheckboxTree.stories.tsx
index 0da4c1b7b7..12f19b17a1 100644
--- a/packages/core/src/components/CheckboxTree/CheckboxTree.stories.tsx
+++ b/packages/core/src/components/CheckboxTree/CheckboxTree.stories.tsx
@@ -66,7 +66,7 @@ export default {
 
 export const Default = () => (
   <CheckboxTree
-    onChange={el => {}}
+    onChange={() => {}}
     label="default"
     subCategories={CHECKBOX_TREE_ITEMS}
   />
diff --git a/packages/core/src/components/Select/Select.stories.tsx b/packages/core/src/components/Select/Select.stories.tsx
index acb6f8afc8..feb5c1cffb 100644
--- a/packages/core/src/components/Select/Select.stories.tsx
+++ b/packages/core/src/components/Select/Select.stories.tsx
@@ -39,7 +39,7 @@ const SELECT_ITEMS = [
 
 export const Default = () => (
   <Select
-    onChange={el => {}}
+    onChange={() => {}}
     placeholder="All results"
     label="Default"
     items={SELECT_ITEMS}
@@ -52,6 +52,6 @@ export const Multiple = () => (
     label="Multiple"
     items={SELECT_ITEMS}
     multiple
-    onChange={el => {}}
+    onChange={() => {}}
   />
 );
diff --git a/packages/core/src/components/Select/Select.tsx b/packages/core/src/components/Select/Select.tsx
index a04c616a7c..5771786f18 100644
--- a/packages/core/src/components/Select/Select.tsx
+++ b/packages/core/src/components/Select/Select.tsx
@@ -35,7 +35,6 @@ import {
 
 import ClosedDropdown from './static/ClosedDropdown';
 import OpenedDropdown from './static/OpenedDropdown';
-import { idea } from 'react-syntax-highlighter/dist/cjs/styles/hljs';
 
 const BootstrapInput = withStyles((theme: Theme) =>
   createStyles({