diff --git a/Source/Core/Core/HW/SI/SI_DeviceGBA.h b/Source/Core/Core/HW/SI/SI_DeviceGBA.h
index d2c2da8e1b..877b25efc8 100644
--- a/Source/Core/Core/HW/SI/SI_DeviceGBA.h
+++ b/Source/Core/Core/HW/SI/SI_DeviceGBA.h
@@ -38,7 +38,7 @@ private:
 
   u64 time_cmd_sent;
   u64 last_time_slice;
-  u8 device_number;
+  int device_number;
   u8 cmd;
   bool booted;
 };