diff --git a/src/utils/resolveId.ts b/src/utils/resolveId.ts
index 15157e17b34..1a95695daf2 100644
--- a/src/utils/resolveId.ts
+++ b/src/utils/resolveId.ts
@@ -45,15 +45,18 @@ export async function resolveId(
 	);
 }
 
-function addJsExtensionIfNecessary(file: string, preserveSymlinks: boolean): string | undefined {
+async function addJsExtensionIfNecessary(
+	file: string,
+	preserveSymlinks: boolean
+): Promise<string | undefined> {
 	return (
-		findFile(file, preserveSymlinks) ??
-		findFile(file + '.mjs', preserveSymlinks) ??
-		findFile(file + '.js', preserveSymlinks)
+		(await findFile(file, preserveSymlinks)) ??
+		(await findFile(file + '.mjs', preserveSymlinks)) ??
+		(await findFile(file + '.js', preserveSymlinks))
 	);
 }
 
-function findFile(file: string, preserveSymlinks: boolean): string | undefined {
+async function findFile(file: string, preserveSymlinks: boolean): Promise<string | undefined> {
 	try {
 		const stats = lstatSync(file);
 		if (!preserveSymlinks && stats.isSymbolicLink())