diff --git a/src/Cache/RateLimit/Middlewares/RateLimiter.php b/src/Cache/RateLimit/Middlewares/RateLimiter.php
index acbf5e16..5a34bc73 100644
--- a/src/Cache/RateLimit/Middlewares/RateLimiter.php
+++ b/src/Cache/RateLimit/Middlewares/RateLimiter.php
@@ -55,10 +55,14 @@ public function handleRequest(Request $request, RequestHandler $next): Response
         $remaining = max(0, $perMinuteLimit - $current);
         $resetTime = time() + $this->rateLimiter->getTtl($clientIp);
 
-        $response->addHeader('x-ratelimit-limit', (string) $perMinuteLimit);
-        $response->addHeader('x-ratelimit-remaining', (string) $remaining);
-        $response->addHeader('x-ratelimit-reset', (string) $resetTime);
-        $response->addHeader('x-ratelimit-reset-after', (string) $this->rateLimiter->getTtl($clientIp));
+        if ($isCustom || ! $response->hasHeader('x-ratelimit-limit')) {
+            $response->replaceHeaders([
+                'x-ratelimit-limit' => (string) $perMinuteLimit,
+                'x-ratelimit-remaining' => (string) $remaining,
+                'x-ratelimit-reset' => (string) $resetTime,
+                'x-ratelimit-reset-after' => (string) $this->rateLimiter->getTtl($clientIp),
+            ]);
+        }
 
         return $response;
     }
diff --git a/tests/Feature/Cache/CustomRateLimiterTest.php b/tests/Feature/Cache/CustomRateLimiterTest.php
index 73fbabcb..558d08c1 100644
--- a/tests/Feature/Cache/CustomRateLimiterTest.php
+++ b/tests/Feature/Cache/CustomRateLimiterTest.php
@@ -75,3 +75,32 @@
     $this->get(path: '/custom')
         ->assertStatusCode(HttpStatus::TOO_MANY_REQUESTS);
 });
+
+it('does not duplicate rate limit headers when global and custom limiters both run', function (): void {
+    Config::set('app.port', 14337);
+    Config::set('cache.rate_limit.enabled', true);
+    Config::set('cache.rate_limit.per_minute', 60);
+
+    Route::get('/custom-with-global', fn (): Response => response()->plain('Ok'))
+        ->middleware(RateLimiter::perMinute(10));
+
+    $this->app->run();
+
+    $responseHeaders = $this->get(path: '/custom-with-global')
+        ->assertOk()
+        ->getHeaders();
+
+    $headers = [
+        'x-ratelimit-limit',
+        'x-ratelimit-remaining',
+        'x-ratelimit-reset',
+        'x-ratelimit-reset-after',
+    ];
+
+    foreach ($headers as $header) {
+        expect($responseHeaders[$header] ?? [])->toHaveCount(1);
+    }
+
+    expect($responseHeaders['x-ratelimit-limit'])->toBe(['10']);
+    expect($responseHeaders['x-ratelimit-remaining'])->toBe(['9']);
+});