diff --git a/lib/JBUS/dmac/ghdl/.gitignore.templ b/lib/JBUS/dmac/ghdl/.gitignore.templ
new file mode 100644
index 0000000..907336a
--- /dev/null
+++ b/lib/JBUS/dmac/ghdl/.gitignore.templ
@@ -0,0 +1,4 @@
+.gitignore
+build/
+.gitignore
+build/
diff --git a/lib/JBUS/dmac/ghdl/tb_dmac_sync.make b/lib/JBUS/dmac/ghdl/tb_dmac_sync.make
index f643b54..0858138 100644
--- a/lib/JBUS/dmac/ghdl/tb_dmac_sync.make
+++ b/lib/JBUS/dmac/ghdl/tb_dmac_sync.make
@@ -14,6 +14,7 @@ SRCS += $(MOD_PATH)/dmac/src/tb_dmac.vhd
 TARGET := tb_dmac_sync
 ENTITY := tb_dmac
 RUN_TIME := 6us
+WAVE_FORMAT := vcd
 
 include $(VHDL_HOME)/make/ghdl.mk