diff --git a/lib/JBUS/busmaster/ghdl/.gitignore.templ b/lib/JBUS/busmaster/ghdl/.gitignore.templ
new file mode 100644
index 0000000..907336a
--- /dev/null
+++ b/lib/JBUS/busmaster/ghdl/.gitignore.templ
@@ -0,0 +1,4 @@
+.gitignore
+build/
+.gitignore
+build/
diff --git a/lib/JBUS/busmaster/ghdl/tb_busmaster_async.make b/lib/JBUS/busmaster/ghdl/tb_busmaster_async.make
index 5882051..efa6b02 100644
--- a/lib/JBUS/busmaster/ghdl/tb_busmaster_async.make
+++ b/lib/JBUS/busmaster/ghdl/tb_busmaster_async.make
@@ -13,6 +13,7 @@ SRCS += $(MOD_PATH)/src/tb_busmaster_async.vhd
 TARGET := tb_busmaster_async
 ENTITY := tb_busmaster_async
 RUN_TIME := 80us
+WAVE_FORMAT := vcd
 
 include $(VHDL_HOME)/make/ghdl.mk
 
diff --git a/lib/JBUS/busmaster/ghdl/tb_busmaster_sync.make b/lib/JBUS/busmaster/ghdl/tb_busmaster_sync.make
index 53873fb..6fe4bb8 100644
--- a/lib/JBUS/busmaster/ghdl/tb_busmaster_sync.make
+++ b/lib/JBUS/busmaster/ghdl/tb_busmaster_sync.make
@@ -13,6 +13,7 @@ SRCS += $(MOD_PATH)/src/tb_busmaster_sync.vhd
 TARGET := tb_busmaster_sync
 ENTITY := tb_busmaster_sync
 RUN_TIME := 40us
+WAVE_FORMAT := vcd
 
 include $(VHDL_HOME)/make/ghdl.mk