diff --git a/src/sbbs3/Common.gmake b/src/sbbs3/Common.gmake
index 8ffb5164cc9f05067c8599354e089cb38ef83683..0a31d3a5fc4fc6ada068a2a80afdad26fdc6aab5 100644
--- a/src/sbbs3/Common.gmake
+++ b/src/sbbs3/Common.gmake
@@ -8,7 +8,7 @@ SBBS_SRC	?=	$(SRC_ROOT)/sbbs3
 SBBS_CFLAGS	+=	-I$(SBBS_SRC)
 
 SBBSDEFS	:=
--include sbbsdefs.mk		# defines $(SBBSDEFS)
+-include $(SBBS_SRC)/sbbsdefs.mk		# defines $(SBBSDEFS)
 SBBS_CFLAGS	+=	$(SBBSDEFS)
 SBBS_LDFLAGS	+=	-L$(SBBS_SRC)/$(LIBODIR)