Index: firmware/usbstack/usb_storage.c
===================================================================
--- firmware/usbstack/usb_storage.c     (revision 16361)
+++ firmware/usbstack/usb_storage.c     (working copy)
@@ -363,9 +363,9 @@
     switch (req->bRequest) {
         case USB_BULK_GET_MAX_LUN: {
 #ifdef ONLY_EXPOSE_CARD_SLOT
-            *max_lun = 0;
+            max_lun[0] = 0;
 #else
-            *max_lun = NUM_VOLUMES - 1;
+            max_lun[0] = NUM_VOLUMES - 1;
 #endif
 #ifdef HAVE_HOTSWAP
             /* Workaround until we find out how to do removable devices properly */