diff --git a/packages/auth/src/oauth-profile.test.ts b/packages/auth/src/oauth-profile.test.ts
index bddcf1dda..84c842caa 100644
--- a/packages/auth/src/oauth-profile.test.ts
+++ b/packages/auth/src/oauth-profile.test.ts
@@ -75,7 +75,7 @@ describe("createProfileMapper", () => {
 		expect(dbMock.update).toHaveBeenCalledTimes(1);
 		expect(dbMock.updateSet).toHaveBeenCalledWith({ email: "legacy.user@example.com" });
 		expect(result).toEqual({
-			id: "legacy-user-id",
+			id: "user-1",
 			name: "Legacy User",
 			email: "legacy.user@example.com",
 			image: "https://example.com/new.png",
@@ -153,6 +153,7 @@ describe("createProfileMapper", () => {
 
 		expect(dbMock.select).toHaveBeenCalledTimes(2);
 		expect(result).toEqual({
+			id: "user-1",
 			name: "GitHub User",
 			email: "github.user@example.com",
 			image: "https://example.com/new.png",
@@ -189,6 +190,7 @@ describe("createProfileMapper", () => {
 		expect(dbMock.update).toHaveBeenCalledTimes(1);
 		expect(dbMock.updateSet).toHaveBeenCalledWith({ email: "legacy.user@example.com" });
 		expect(result).toEqual({
+			id: "user-1",
 			name: "Legacy User",
 			email: "legacy.user@example.com",
 			image: "https://example.com/new.png",
diff --git a/packages/auth/src/oauth-profile.ts b/packages/auth/src/oauth-profile.ts
index 8930530ca..31b7d91fe 100644
--- a/packages/auth/src/oauth-profile.ts
+++ b/packages/auth/src/oauth-profile.ts
@@ -186,7 +186,7 @@ export function createProfileMapper<TProfile extends OAuthProfile>({
 			await normalizeExistingUserEmail(existingUser.id, existingUser.email, existingEmail);
 
 			return {
-				...(existingUser.accountId ? { id: existingUser.accountId } : {}),
+				id: existingUser.id,
 				name: existingUser.name,
 				email: existingEmail,
 				image: image ?? existingUser.image,