diff --git a/src/video/vid_voodoo_render.c b/src/video/vid_voodoo_render.c
index 19dedfa7a..1c0edf775 100644
--- a/src/video/vid_voodoo_render.c
+++ b/src/video/vid_voodoo_render.c
@@ -1389,10 +1389,9 @@ skip_pixel:
         voodoo->texel_count[odd_even] += state->texel_count;
         voodoo->fbiPixelsIn += state->pixel_count;
 
-        if (voodoo->params.draw_offset == voodoo->params.front_offset) {
-            int dirty_idx = SLI_ENABLED ? (real_y >> 1) : real_y;
-            if (dirty_idx < 2048)
-                voodoo->dirty_line[dirty_idx] = 1;
+        if (voodoo->params.draw_offset == voodoo->params.front_offset && !SLI_ENABLED) {
+            if (real_y < 2048)
+                voodoo->dirty_line[real_y] = 1;
         }
 
 next_line: