diff --git a/bufferevent.c b/bufferevent.c
index 98003ac7..7c03ce90 100644
--- a/bufferevent.c
+++ b/bufferevent.c
@@ -398,7 +398,7 @@ bufferevent_get_base(struct bufferevent *bufev)
 }
 
 int
-bufferevent_get_priority(struct bufferevent *bufev)
+bufferevent_get_priority(const struct bufferevent *bufev)
 {
 	if (event_initialized(&bufev->ev_read)) {
 		return event_get_priority(&bufev->ev_read);
diff --git a/include/event2/bufferevent.h b/include/event2/bufferevent.h
index 0d94e8d1..4ed4e5d1 100644
--- a/include/event2/bufferevent.h
+++ b/include/event2/bufferevent.h
@@ -278,7 +278,7 @@ int bufferevent_priority_set(struct bufferevent *bufev, int pri);
 
    Only supported for socket bufferevents
  */
-int bufferevent_get_priority(struct bufferevent *bufev);
+int bufferevent_get_priority(const struct bufferevent *bufev);
 
 /**
   Deallocate the storage associated with a bufferevent structure.