diff --git a/reactos/drivers/base/bootvid/precomp.h b/reactos/drivers/base/bootvid/precomp.h
index 88c95e7f4f2..276432bc6ca 100644
--- a/reactos/drivers/base/bootvid/precomp.h
+++ b/reactos/drivers/base/bootvid/precomp.h
@@ -1,3 +1,5 @@
+void _enable(void);
+void _disable(void);
 #include "ntddk.h"
 #include "arc/arc.h"
 #include "halfuncs.h"
diff --git a/reactos/drivers/base/kdcom/kdbg.c b/reactos/drivers/base/kdcom/kdbg.c
index 6180bd4f007..4726dd586df 100644
--- a/reactos/drivers/base/kdcom/kdbg.c
+++ b/reactos/drivers/base/kdcom/kdbg.c
@@ -12,6 +12,11 @@
 
 /* INCLUDES *****************************************************************/
 
+#ifdef _MSC_VER
+void _enable(void);
+void _disable(void);
+#endif
+
 #define NOEXTAPI
 #include <ntddk.h>
 #define NDEBUG