diff --git a/libsrc/cbm/cbm.inc b/libsrc/cbm/cbm.inc
index 8caaa66a8..25e48a72f 100644
--- a/libsrc/cbm/cbm.inc
+++ b/libsrc/cbm/cbm.inc
@@ -61,7 +61,7 @@ CBMDEV_SCREEN   = 3
 ; Disk stuff
 ;
 
-MAX_DRIVES      = 24
+MAX_DRIVES      = 23
 FIRST_DRIVE     = 8