diff --git a/game/shared/in_buttons.h b/game/shared/in_buttons.h
new file mode 100644
index 00000000..e65e6255
--- /dev/null
+++ b/game/shared/in_buttons.h
@@ -0,0 +1,32 @@
+#ifndef IN_BUTTONS_H
+#define IN_BUTTONS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "platform.h"
+
+enum InputBitMask_t : int64
+{
+	IN_NONE	= 0,
+	IN_ALL	= -1,
+
+	IN_ATTACK			= (1 << 0),
+	IN_JUMP				= (1 << 1),
+	IN_DUCK				= (1 << 2),
+	IN_FORWARD			= (1 << 3),
+	IN_BACK				= (1 << 4),
+	IN_USE				= (1 << 5),
+	IN_TURNLEFT			= (1 << 7),
+	IN_TURNRIGHT		= (1 << 8),
+	IN_MOVELEFT			= (1 << 9),
+	IN_MOVERIGHT		= (1 << 10),
+	IN_ATTACK2			= (1 << 11),
+	IN_RELOAD			= (1 << 13),
+	IN_SPEED			= (1 << 16), // Player is holding the speed key
+	IN_JOYAUTOSPRINT	= (1 << 17),
+
+	IN_FIRST_MOD_SPECIFIC_BIT = (1 << 32),
+};
+
+#endif // IN_BUTTONS_H
\ No newline at end of file
diff --git a/game/shared/shareddefs.h b/game/shared/shareddefs.h
index 4c90495c..a0beef11 100644
--- a/game/shared/shareddefs.h
+++ b/game/shared/shareddefs.h
@@ -11,7 +11,11 @@
 #pragma once
 #endif
 
+#include "platform.h"
+#include "vector.h"
+
 #include "const.h"
+#include "in_buttons.h"
 
 #define TICK_INTERVAL			(gpGlobals->interval_per_tick)