1 files changed, 4 insertions, 2 deletions
diff --git a/include/mbgl/actor/mailbox.hpp b/include/mbgl/actor/mailbox.hpp
index cff0de243a..1327e8e6fe 100644
--- a/include/mbgl/actor/mailbox.hpp
+++ b/include/mbgl/actor/mailbox.hpp
@@ -23,8 +23,10 @@ public:
 private:
     Scheduler& scheduler;
 
-    std::mutex closingMutex;
-    bool closing { false };
+    std::mutex receivingMutex;
+    std::mutex pushingMutex;
+
+    bool closed { false };
 
     std::mutex queueMutex;
     std::queue<std::unique_ptr<Message>> queue;