diff --git a/src/client.ts b/src/client.ts
index ef0b007..8f973c0 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -835,7 +835,7 @@ export class Gitpod {
         Accept: 'application/json',
         'User-Agent': this.getUserAgent(),
         'X-Stainless-Retry-Count': String(retryCount),
-        ...(options.timeout ? { 'X-Stainless-Timeout': String(options.timeout) } : {}),
+        ...(options.timeout ? { 'X-Stainless-Timeout': String(Math.trunc(options.timeout / 1000)) } : {}),
         ...getPlatformHeaders(),
       },
       this.authHeaders(options),