diff --git a/kernel/vmem.z80 b/kernel/vmem.z80
index 5922cae..9db264a 100644
--- a/kernel/vmem.z80
+++ b/kernel/vmem.z80
@@ -14,6 +14,11 @@
 ; DE contains the bank # in the card 
 ; The contents of A, IX and C are destroyed
 set_frame:
+  push bc
+  push de
+  call clear_frame
+  pop de
+  pop bc
   ld a, c
   ld (card_set+2), a
   ld (low_set+2), a