diff --git a/src/buffer_manager.hh b/src/buffer_manager.hh
index 7a380959..75066bd9 100644
--- a/src/buffer_manager.hh
+++ b/src/buffer_manager.hh
@@ -9,8 +9,6 @@
 namespace Kakoune
 {
 
-class MappedFile;
-
 class BufferManager : public Singleton<BufferManager>
 {
 public: