diff --git a/packages/vite/src/node/optimizer/index.ts b/packages/vite/src/node/optimizer/index.ts
index 94447b9403393b..9ffc7f72a1ace9 100644
--- a/packages/vite/src/node/optimizer/index.ts
+++ b/packages/vite/src/node/optimizer/index.ts
@@ -612,6 +612,7 @@ export async function runOptimizeDeps(
     ignoreAnnotations: !isBuild,
     metafile: true,
     plugins,
+    charset: 'utf8',
     ...esbuildOptions,
     supported: {
       'dynamic-import': true,
diff --git a/packages/vite/src/node/plugins/esbuild.ts b/packages/vite/src/node/plugins/esbuild.ts
index a10ebfe6dcab1b..137911377d15be 100644
--- a/packages/vite/src/node/plugins/esbuild.ts
+++ b/packages/vite/src/node/plugins/esbuild.ts
@@ -180,6 +180,7 @@ export function esbuildPlugin(options: ESBuildOptions = {}): Plugin {
   // and for build as the final optimization is in `buildEsbuildPlugin`
   const transformOptions: TransformOptions = {
     target: 'esnext',
+    charset: 'utf8',
     ...options,
     minify: false,
     minifyIdentifiers: false,