diff --git a/devices/common/machineid.h b/devices/common/machineid.h
index 7d81c50..36df9f4 100644
--- a/devices/common/machineid.h
+++ b/devices/common/machineid.h
@@ -82,7 +82,7 @@ public:
     ~GossamerID() = default;
 
     uint32_t read(uint32_t rgn_start, uint32_t offset, int size) {
-        return ((!offset && size == 2) ? this->id : 0);
+        return ((offset == 4 && size == 2) ? this->id : 0);
     };
 
     /* not writable */
diff --git a/machines/machinegossamer.cpp b/machines/machinegossamer.cpp
index eb44f52..4ffa438 100644
--- a/machines/machinegossamer.cpp
+++ b/machines/machinegossamer.cpp
@@ -109,7 +109,7 @@ int initialize_gossamer(std::string& id)
 
     gMachineObj->add_device("MachineID", std::unique_ptr<GossamerID>(new GossamerID(sys_reg)));
     grackle_obj->add_mmio_region(
-        0xFF000000 + 4, 4096 - 4, dynamic_cast<MMIODevice*>(gMachineObj->get_comp_by_name("MachineID")));
+        0xFF000000, 4096, dynamic_cast<MMIODevice*>(gMachineObj->get_comp_by_name("MachineID")));
 
     // allocate ROM region
     if (!grackle_obj->add_rom_region(0xFFC00000, 0x400000)) {