diff --git a/Source/Core/Core/HW/EXI/BBA-TAP/TAP_Win32.h b/Source/Core/Core/HW/EXI/BBA-TAP/TAP_Win32.h
index b87030f026..dd0eba3235 100644
--- a/Source/Core/Core/HW/EXI/BBA-TAP/TAP_Win32.h
+++ b/Source/Core/Core/HW/EXI/BBA-TAP/TAP_Win32.h
@@ -31,6 +31,8 @@
 // the TAP-Win32 driver and contains definitions
 // common to both.
 //===============================================
+#pragma once
+
 #include <windows.h>
 #include <stdlib.h>
 #include <winioctl.h>