diff --git a/src/runtimes/isomorphic/auth/xhr_auth.ts b/src/runtimes/isomorphic/auth/xhr_auth.ts
index 91edea64b..88fb93101 100644
--- a/src/runtimes/isomorphic/auth/xhr_auth.ts
+++ b/src/runtimes/isomorphic/auth/xhr_auth.ts
@@ -33,6 +33,13 @@ const ajax: AuthTransport = function(
       xhr.setRequestHeader(headerName, dynamicHeaders[headerName]);
     }
   }
+  if (authOptions.signal) {
+    authOptions.signal.addEventListener('abort', () => {
+      if (xhr.readyState != 4) {
+        xhr.abort();
+      }
+    });
+  }
 
   xhr.onreadystatechange = function() {
     if (xhr.readyState === 4) {