diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index e96360b47a..552f3401e2 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -2458,7 +2458,11 @@ pc_machine_get_device_memory_region_size(Object *obj, Visitor *v,
                                          Error **errp)
 {
     MachineState *ms = MACHINE(obj);
-    int64_t value = memory_region_size(&ms->device_memory->mr);
+    int64_t value = 0;
+
+    if (ms->device_memory) {
+        value = memory_region_size(&ms->device_memory->mr);
+    }
 
     visit_type_int(v, name, &value, errp);
 }