diff --git a/src/index.ts b/src/index.ts
index e40abdf..0c9e747 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -90,10 +90,7 @@ export function readUser<T extends RC = RC>(options?: RCOptions | string): T {
 
 export function serialize<T extends RC = RC>(config: T): string {
   return Object.entries(flat.flatten<RC, RC>(config))
-    .map(
-      ([key, value]) =>
-        `${key}=${typeof value === "string" ? value : JSON.stringify(value)}`
-    )
+    .map(([key, value]) => `${key}=${JSON.stringify(value)}`)
     .join("\n");
 }
 
diff --git a/test/index.test.ts b/test/index.test.ts
index c7ef4d3..8c492e9 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -37,7 +37,7 @@ describe("rc", () => {
 
   test("Update user config", () => {
     updateUser({ "db.password": '"123"' });
-    expect(readUser().db.password).toBe("123");
+    expect(readUser().db.password).toBe(`"123"`);
   });
 
   test("Parse ignore invalid lines", () => {