diff --git a/rs/src/management/http_client.rs b/rs/src/management/http_client.rs
index 7279668d..216432b3 100644
--- a/rs/src/management/http_client.rs
+++ b/rs/src/management/http_client.rs
@@ -582,7 +582,7 @@ fn create_full_user_agent(user_agent: &str) -> String {
         let hklm = RegKey::predef(HKEY_LOCAL_MACHINE);
         let key = hklm.open_subkey("SOFTWARE\\Microsoft\\Windows365");
         if let Ok(id) = key.and_then(|k| k.get_value::<String, _>("PartnerId")) {
-            full_user_agent.push_str(" Windows-Partner-Id: ");
+            full_user_agent.push_str("; Windows-Partner-Id: ");
             full_user_agent.push_str(&id);
         }
     }