diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index 5bc9df58a0..09b3366024 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -78,6 +78,13 @@
 
 #define MAC_CLOCK  3686418
 
+/*
+ * Slot 0x9 is reserved for use by the in-built framebuffer whilst only
+ * slots 0xc, 0xd and 0xe physically exist on the Quadra 800
+ */
+#define Q800_NUBUS_SLOTS_AVAILABLE    (BIT(0x9) | BIT(0xc) | BIT(0xd) | \
+                                       BIT(0xe))
+
 /*
  * The GLUE (General Logic Unit) is an Apple custom integrated circuit chip
  * that performs a variety of functions (RAM management, clock generation, ...).
@@ -392,6 +399,8 @@ static void q800_init(MachineState *machine)
     /* NuBus */
 
     dev = qdev_new(TYPE_MAC_NUBUS_BRIDGE);
+    qdev_prop_set_uint32(dev, "slot-available-mask",
+                         Q800_NUBUS_SLOTS_AVAILABLE);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0,
                     MAC_NUBUS_FIRST_SLOT * NUBUS_SUPER_SLOT_SIZE);