--- a/src/index/beaglequeue.h
+++ b/src/index/beaglequeue.h
@@ -16,6 +16,9 @@
  */
 #ifndef _beaglequeue_h_included_
 #define _beaglequeue_h_included_
+
+#include <list>
+using std::list;
 
 /**
  * Process the Beagle indexing queue.