diff --git a/src/video/vid_tgui9440.c b/src/video/vid_tgui9440.c
index fd8514301..b59404f15 100644
--- a/src/video/vid_tgui9440.c
+++ b/src/video/vid_tgui9440.c
@@ -1472,7 +1472,7 @@ tgui_accel_command(int count, uint32_t cpu_dat, tgui_t *tgui)
 		case TGUI_BRESENHAMLINE:
 		{
 			if (count == -1) {
-				tgui->accel.cx = tgui->accel.src_x;
+				tgui->accel.cx = tgui->accel.src_y;
 				tgui->accel.cy = tgui->accel.src_y;
 				tgui->accel.dx = tgui->accel.dst_x;
 				tgui->accel.dy = tgui->accel.dst_y;