diff --git a/LEGO1/omni/src/video/mxdisplaysurface.cpp b/LEGO1/omni/src/video/mxdisplaysurface.cpp
index 04069bba..647de44a 100644
--- a/LEGO1/omni/src/video/mxdisplaysurface.cpp
+++ b/LEGO1/omni/src/video/mxdisplaysurface.cpp
@@ -1094,7 +1094,7 @@ MxBool MxDisplaySurface::VTable0x2c(
 }
 
 // FUNCTION: LEGO1 0x100bc8b0
-LPDIRECTDRAWSURFACE MxDisplaySurface::FUN_100bc8b0(int width, int height)
+LPDIRECTDRAWSURFACE MxDisplaySurface::FUN_100bc8b0(MxS32 width, MxS32 height)
 {
 	LPDIRECTDRAWSURFACE surface = NULL;