diff --git a/packages/feature-flag-client/src/client.ts b/packages/feature-flag-client/src/client.ts
index 7de5b93c..360021d1 100644
--- a/packages/feature-flag-client/src/client.ts
+++ b/packages/feature-flag-client/src/client.ts
@@ -54,8 +54,13 @@ export function createFeatureFlagClient(config: FeatureFlagClientConfig): Featur
       const parts = [`platform=${encodeURIComponent(platform)}`];
       if (userId) parts.push(`userId=${encodeURIComponent(userId)}`);
 
+      const requestId =
+        typeof globalThis.crypto?.randomUUID === 'function'
+          ? globalThis.crypto.randomUUID()
+          : `${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
+
       const res = await globalThis.fetch(`${baseUrl}/flags/poll?${parts.join('&')}`, {
-        headers: { 'x-product-id': productId },
+        headers: { 'x-product-id': productId, 'x-request-id': requestId },
       });
 
       if (!res.ok) return;
diff --git a/packages/kill-switch-client/src/index.ts b/packages/kill-switch-client/src/index.ts
index c8ebd2f3..e41339d5 100644
--- a/packages/kill-switch-client/src/index.ts
+++ b/packages/kill-switch-client/src/index.ts
@@ -44,10 +44,15 @@ export function createKillSwitchClient(config: KillSwitchClientConfig): KillSwit
 
   async function check(): Promise<KillSwitchResult> {
     try {
+      const requestId =
+        typeof globalThis.crypto?.randomUUID === 'function'
+          ? globalThis.crypto.randomUUID()
+          : `${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
+
       const res = await globalThis.fetch(
         `${baseUrl}/flags/kill-switch?platform=${encodeURIComponent(platform)}`,
         {
-          headers: { 'x-product-id': productId },
+          headers: { 'x-product-id': productId, 'x-request-id': requestId },
         }
       );