diff --git a/targettest/apple2/dhgrshow.c b/targettest/apple2/dhgrshow.c
index f0b37e461..8bc8bcebd 100644
--- a/targettest/apple2/dhgrshow.c
+++ b/targettest/apple2/dhgrshow.c
@@ -40,6 +40,7 @@ void main (void)
     }
     closedir (dir);
 
+    POKE (0xC05F, 0);
     tgi_uninstall ();
     videomode (old);
 }