diff --git a/frontend/src/lib/oauth.ts b/frontend/src/lib/oauth.ts
index df7b9a6..3ee6400 100644
--- a/frontend/src/lib/oauth.ts
+++ b/frontend/src/lib/oauth.ts
@@ -98,13 +98,13 @@ export async function exchangeCode(
 // --- PKCE verifier persistence (avant redirect) ---
 
 export function saveVerifier(verifier: string): void {
-  sessionStorage.setItem(SESSION_KEY_VERIFIER, verifier);
+  localStorage.setItem(SESSION_KEY_VERIFIER, verifier);
 }
 
 export function loadVerifier(): string | null {
-  return sessionStorage.getItem(SESSION_KEY_VERIFIER);
+  return localStorage.getItem(SESSION_KEY_VERIFIER);
 }
 
 export function clearVerifier(): void {
-  sessionStorage.removeItem(SESSION_KEY_VERIFIER);
+  localStorage.removeItem(SESSION_KEY_VERIFIER);
 }