diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51be2af33..e2a959db8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1880,7 +1880,6 @@ set_src(BASE GLOB_RECURSE src/base
   rust.h
   system.cpp
   system.h
-  tl/bitmask.h
   tl/threading.h
   types.h
   unicode/confusables.cpp
diff --git a/src/base/tl/bitmask.h b/src/base/tl/bitmask.h
deleted file mode 100644
index 38e703925..000000000
--- a/src/base/tl/bitmask.h
+++ /dev/null
@@ -1,8 +0,0 @@
-/* (c) DDNet Team. See licence.txt in the root of the distribution for more information.     */
-/* If you are missing that file, acquire a complete release at teeworlds.com.                */
-#ifndef BASE_TL_BITMASK_H
-#define BASE_TL_BITMASK_H
-
-#include <bitset>
-
-#endif
diff --git a/src/engine/shared/protocol.h b/src/engine/shared/protocol.h
index 46c085d14..47f2bd655 100644
--- a/src/engine/shared/protocol.h
+++ b/src/engine/shared/protocol.h
@@ -3,7 +3,7 @@
 #ifndef ENGINE_SHARED_PROTOCOL_H
 #define ENGINE_SHARED_PROTOCOL_H
 
-#include <base/tl/bitmask.h>
+#include <bitset>
 
 /*
 	Connection diagram - How the initialization works.