diff --git a/frontend/src/pages/MainPage.js b/frontend/src/pages/MainPage.js
index 929a0bb..98897ce 100644
--- a/frontend/src/pages/MainPage.js
+++ b/frontend/src/pages/MainPage.js
@@ -29,7 +29,7 @@ export default class MainPage extends React.Component {
     }
 
     updateFilterState(newFilter) {
-        this.setState({ filters: { ...this.state.filters, ...newFilter } })
+        this.setState({ filters: Object.assign(this.state.filters, newFilter) })
         this.updatePlants()
     }