diff --git a/packages/core/src/core/contentGenerator.ts b/packages/core/src/core/contentGenerator.ts
index 92736521..058e69a6 100644
--- a/packages/core/src/core/contentGenerator.ts
+++ b/packages/core/src/core/contentGenerator.ts
@@ -111,7 +111,7 @@ export async function createContentGenerator(
   const version = process.env.CLI_VERSION || process.version;
   const httpOptions = {
     headers: {
-      'User-Agent': `GeminiCLI/${version}/(${process.platform}; ${process.arch})`,
+      'User-Agent': `GeminiCLI/${version} (${process.platform}; ${process.arch})`,
     },
   };
   if (