diff --git a/vivado/Makefile.rules b/vivado/Makefile.rules
index 2638a92..faace9e 100644
--- a/vivado/Makefile.rules
+++ b/vivado/Makefile.rules
@@ -7,6 +7,9 @@ XSIM  ?= xsim
 vpath %.sv  $(PATH_SRC)
 vpath %.svh $(PATH_SRC)
 
+INC_DIRS=$(patsubst %,-i %,$(subst :, ,$(PATH_SRC)))
+DEFS=$(patsubst %,-d %,$(subst :, ,$(DEFINES)))
+
 .SUFFIXES:
 .SUFFIXES: .sv .svh .sdb
 
@@ -17,7 +20,7 @@ all: sim
 OBJS=$(subst sv,sdb,$(SOURCES))
 
 xsim.dir/work/%.sdb: %.sv $(INCLUDES)
-	$(XVLOG) --sv --nolog $<
+	$(XVLOG) --sv --nolog $< $(INC_DIRS) $(DEFS)
 	rm xvlog.pb
 
 xsim.dir/work.$(TB)/xsim.dbg:	$(addprefix xsim.dir/work/, $(OBJS))