diff --git a/src/lib.rs b/src/lib.rs
index 53256ec..91505f4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -702,6 +702,10 @@ impl Client {
             .header(reqwest::header::USER_AGENT, &self.user_agent)
             .header(reqwest::header::CONTENT_TYPE, "application/json")
             .header(reqwest::header::ACCEPT, "application/json")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
             .json(&json!({
                 "id": "ID",
                 "method": "getLatestImportTime",