diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index 804c636..c37cfea 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -109,7 +109,7 @@ interface MegaDialogAccount {
   password: string;
 }
 
-interface AccountDialogState {
+export interface AccountDialogState {
   mode: "create" | "edit";
   kind: AccountKind | null;
   token: string;
@@ -647,7 +647,7 @@ function createAccountDialogState(mode: "create" | "edit", kind: AccountKind | n
   }
 }
 
-function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDialogState): AppSettings {
+export function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDialogState): AppSettings {
   if (!dialog.kind) {
     return settings;
   }
@@ -682,7 +682,7 @@ function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDial
       const firstPassword = megaParsed.length > 0 ? megaParsed[0].password : "";
       const validIds = new Set(megaParsed.map((a) => a.id));
       const megaDebridDisabledAccountIds = (dialog.megaDisabledIds || []).filter((id) => validIds.has(id));
-      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridApiEnabled: true, megaDebridPreferApi: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
+      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridApiEnabled: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
     }
     case "megadebrid-web": {
       const megaSerialized = serializeMegaDebridAccounts(dialog.megaAccounts);
@@ -691,7 +691,7 @@ function applyAccountDialogToSettings(settings: AppSettings, dialog: AccountDial
       const firstPassword = megaParsed.length > 0 ? megaParsed[0].password : "";
       const validIds = new Set(megaParsed.map((a) => a.id));
       const megaDebridDisabledAccountIds = (dialog.megaDisabledIds || []).filter((id) => validIds.has(id));
-      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridWebEnabled: true, megaDebridPreferApi: false, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
+      return { ...settings, megaCredentials: megaSerialized, megaLogin: firstLogin, megaPassword: firstPassword, megaDebridWebEnabled: true, megaDebridDisabledAccountIds, providerDailyLimitBytes: nextProviderDailyLimitBytes };
     }
     case "bestdebrid-api":
       return { ...settings, bestToken: token, bestDebridUseWebLogin: false, providerDailyLimitBytes: nextProviderDailyLimitBytes };
diff --git a/tests/account-dialog-prefer-api.test.ts b/tests/account-dialog-prefer-api.test.ts
new file mode 100644
index 0000000..bf57c79
--- /dev/null
+++ b/tests/account-dialog-prefer-api.test.ts
@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import { applyAccountDialogToSettings, AccountDialogState } from "../src/renderer/App";
+import { defaultSettings } from "../src/main/constants";
+
+function megaDialog(kind: "megadebrid-api" | "megadebrid-web"): AccountDialogState {
+  return {
+    mode: "edit",
+    kind,
+    token: "",
+    login: "",
+    password: "",
+    dailyLimitGb: "",
+    keyDailyLimitGbById: {},
+    megaAccounts: [{ login: "user@x", password: "pw" }],
+    megaNewLogin: "",
+    megaNewPassword: "",
+    megaDisabledIds: []
+  };
+}
+
+describe("applyAccountDialogToSettings — keeps the user's Mega preferApi choice", () => {
+  it("does not flip megaDebridPreferApi to true when editing the API account", () => {
+    const settings = { ...defaultSettings(), megaDebridApiEnabled: true, megaDebridWebEnabled: true, megaDebridPreferApi: false };
+    const next = applyAccountDialogToSettings(settings, megaDialog("megadebrid-api"));
+    expect(next.megaDebridApiEnabled).toBe(true);
+    expect(next.megaDebridPreferApi).toBe(false);
+  });
+
+  it("does not flip megaDebridPreferApi to false when editing the Web account", () => {
+    const settings = { ...defaultSettings(), megaDebridApiEnabled: true, megaDebridWebEnabled: true, megaDebridPreferApi: true };
+    const next = applyAccountDialogToSettings(settings, megaDialog("megadebrid-web"));
+    expect(next.megaDebridWebEnabled).toBe(true);
+    expect(next.megaDebridPreferApi).toBe(true);
+  });
+});