diff --git a/Makefile b/Makefile
index 54eb15bc..37793aaf 100644
--- a/Makefile
+++ b/Makefile
@@ -451,6 +451,7 @@ DTSCPPFLAGS	=	$(CPPFLAGS) -nostdinc -nostdlib -fno-builtin -D__DTS__ -x assemble
 
 ifneq ($(DEBUG),)
 CFLAGS		+=	-O0
+CPPFLAGS	+=	-DOPENSBI_DEBUG
 else
 CFLAGS		+=	-O2
 endif