diff --git a/src/devices/video/psx.c b/src/devices/video/psx.c
index 167280e3415..29362df326e 100644
--- a/src/devices/video/psx.c
+++ b/src/devices/video/psx.c
@@ -724,7 +724,7 @@ UINT32 psxgpu_device::update_screen(screen_device &screen, bitmap_ind16 &bitmap,
 			n_line = n_lines;
 			while( n_line > 0 )
 			{
-				UINT16 *p_n_src = p_p_vram[ n_y + n_displaystarty ] + ((n_x + n_displaystartx) * 3);
+				UINT16 *p_n_src = p_p_vram[ n_y + n_displaystarty ] + 3 * n_x + n_displaystartx;
 				UINT16 *p_n_dest = &bitmap.pix16(n_y + n_top, n_x + n_left);
 
 				n_column = n_columns;