diff --git a/include/c64_easyflash.mfk b/include/c64_easyflash.mfk
index 08d68075..a23be8e2 100644
--- a/include/c64_easyflash.mfk
+++ b/include/c64_easyflash.mfk
@@ -2,7 +2,7 @@ import err
 
 inline asm void switch_hirom(byte register(a) bank) {
     ? and #$3F
-    ! sta $DE01
+    ! sta $DE00
     ? rts
 }