diff --git a/vlsi/Makefile b/vlsi/Makefile
index 924fa964..4de7fcf4 100644
--- a/vlsi/Makefile
+++ b/vlsi/Makefile
@@ -33,12 +33,11 @@ else
 endif	
 
 ENV_YML            ?= $(vlsi_dir)/env.yml
-INPUT_CONFS        ?= example-tools.yml \
-                      $(if $(filter $(tech_name),nangate45),\
-                        example-nangate45.yml,\
-                        $(if $(filter $(tech_name),asap7),\
-							example-asap7.yml,\
-							example-sky130.yml))
+TECH_CONF          ?= $(if $(filter $(tech_name),nangate45), 	example-nangate45.yml,\
+                      $(if $(filter $(tech_name),asap7),		example-asap7.yml,\
+																example-sky130.yml))
+TOOLS_CONF		   ?= example-tools.yml
+INPUT_CONFS        ?= $(TOOLS_CONF) $(TECH_CONF)
 HAMMER_EXEC        ?= $(if $(filter $(tech_name),sky130),\
                         ./example-vlsi-sky130,\
                         ./example-vlsi)