1 files changed, 5 insertions, 0 deletions
diff --git a/opendc-web/opendc-web-ui/src/components/app/map/controls/ScaleIndicatorComponent.js b/opendc-web/opendc-web-ui/src/components/app/map/controls/ScaleIndicatorComponent.js
index 13226602..ef633764 100644
--- a/opendc-web/opendc-web-ui/src/components/app/map/controls/ScaleIndicatorComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/map/controls/ScaleIndicatorComponent.js
@@ -1,3 +1,4 @@
+import PropTypes from 'prop-types'
 import React from 'react'
 import { TILE_SIZE_IN_METERS, TILE_SIZE_IN_PIXELS } from '../MapConstants'
 import { scaleIndicator } from './ScaleIndicatorComponent.module.scss'
@@ -8,4 +9,8 @@ const ScaleIndicatorComponent = ({ scale }) => (
     </div>
 )
 
+ScaleIndicatorComponent.propTypes = {
+    scale: PropTypes.number.isRequired,
+}
+
 export default ScaleIndicatorComponent