diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index d3a95f0bb..cbbf98ab4 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -1587,6 +1587,8 @@ svga_poll(void *priv)
                 svga->half_pixel  = 0;
                 svga->scrollcache &= 0x07;
             } else {
+                if (svga->scrollcache > 7)
+                    svga->scrollcache = 7;
                 svga->half_pixel  = svga->scrollcache & 0x01;
                 svga->scrollcache = (svga->scrollcache & 0x06) >> 1;
             }