diff --git a/reactos/ntoskrnl/include/internal/cm.h b/reactos/ntoskrnl/include/internal/cm.h
index 52637b29bc9..62f4010f20b 100644
--- a/reactos/ntoskrnl/include/internal/cm.h
+++ b/reactos/ntoskrnl/include/internal/cm.h
@@ -1607,7 +1607,6 @@ extern BOOLEAN CmpProfileLoaded;
 extern PCMHIVE CmiVolatileHive;
 extern LIST_ENTRY CmiKeyObjectListHead;
 extern BOOLEAN CmpHoldLazyFlush;
-extern UNICODE_STRING CmRegistryMachineSystemName;
 
 //
 // Inlined functions