diff --git a/reactos/tools/mkhive/ntoskrnl.h b/reactos/tools/mkhive/ntoskrnl.h
index 5b6b6dad737..de4c7c18feb 100644
--- a/reactos/tools/mkhive/ntoskrnl.h
+++ b/reactos/tools/mkhive/ntoskrnl.h
@@ -4,3 +4,11 @@
 
 #define NDEBUG
 #include "mkhive.h"
+
+PVOID
+NTAPI
+CmpAllocate(
+    IN SIZE_T Size,
+    IN BOOLEAN Paged,
+    IN ULONG Tag
+);