diff --git a/src/video/vid_s3.c b/src/video/vid_s3.c
index 27c364898f..e387245c9d 100644
--- a/src/video/vid_s3.c
+++ b/src/video/vid_s3.c
@@ -4093,6 +4093,11 @@ s3_recalctimings(svga_t *svga)
             }
         }
     }
+
+    if ((s3->chip == S3_TRIO32) || (s3->chip == S3_TRIO64))
+        svga->hoverride = 1;
+    else
+        svga->hoverride = 0;
 }
 
 static void
@@ -4271,6 +4276,8 @@ s3_trio64v_recalctimings(svga_t *svga)
                 break;
         }
     }
+
+    svga->hoverride = 1;
 }
 
 static void