diff --git a/site/package.json b/site/package.json
index 2664945b3..72306bf52 100644
--- a/site/package.json
+++ b/site/package.json
@@ -110,6 +110,7 @@
 		"@types/styled-components": "^5.1.9",
 		"@typescript-eslint/eslint-plugin": "^4.0.1",
 		"@typescript-eslint/parser": "^4.0.1",
+		"@vitejs/plugin-legacy": "^1.6.4",
 		"@vitejs/plugin-react": "^1.1.0",
 		"babel-plugin-styled-components": "^1.10.7",
 		"concurrently": "^6.0.2",
diff --git a/site/source/pages/Stats/Chart.tsx b/site/source/pages/Stats/Chart.tsx
index f14c6a9e8..c95c61ba0 100644
--- a/site/source/pages/Stats/Chart.tsx
+++ b/site/source/pages/Stats/Chart.tsx
@@ -235,4 +235,4 @@ const formatLegend = (key: string) =>
 		? 'simulation commencée'
 		: key === 'simulation_terminee'
 		? 'simulation terminée'
-		: key.replaceAll('_', ' ')
+		: key.replace(/_/g, ' ')
diff --git a/site/vite.config.ts b/site/vite.config.ts
index 081ab9cd3..8e2b74c70 100644
--- a/site/vite.config.ts
+++ b/site/vite.config.ts
@@ -1,8 +1,9 @@
 import yaml from '@rollup/plugin-yaml'
+import legacy from '@vitejs/plugin-legacy'
 import react from '@vitejs/plugin-react'
+import { promises as fs } from 'fs'
 import path from 'path'
 import toml from 'rollup-plugin-toml'
-import { promises as fs } from 'fs'
 import { defineConfig, Plugin } from 'vite'
 import { watchDottedNames } from '../modele-social/build.js'
 
@@ -54,6 +55,9 @@ export default defineConfig({
 				},
 			},
 		}),
+		legacy({
+			targets: ['defaults', 'not IE 11'],
+		}),
 	],
 })