diff --git a/sys/modules/mfi/Makefile b/sys/modules/mfi/Makefile
index 733d6fcc2b5..1adee89f006 100644
--- a/sys/modules/mfi/Makefile
+++ b/sys/modules/mfi/Makefile
@@ -7,8 +7,10 @@ SUBDIR= mfi_linux
 .endif
 
 KMOD=	mfi
-SRCS=	mfi.c mfi_pci.c mfi_disk.c
+SRCS=	mfi.c mfi_pci.c mfi_disk.c mfi_debug.c
 SRCS+=	opt_mfi.h
 SRCS+=	device_if.h bus_if.h pci_if.h
 
+#CFLAGS += -DMFI_DEBUG
+
 .include <bsd.kmod.mk>