diff --git a/npc/Makefile b/npc/Makefile
index 7756a49..2fa4357 100644
--- a/npc/Makefile
+++ b/npc/Makefile
@@ -11,6 +11,6 @@ sim: obj_dir
 	@echo "Write this Makefile by your self."
 
 obj_dir: $(VSRC) $(CPPSRC)
-	$(VERILATOR) $(VSRC:%=--cc %) $< $(CPPSRC:%=--exe %) --Mdir $@
+	$(VERILATOR) $(VSRC:%=--cc %) $(CPPSRC:%=--exe %) --Mdir $@
 
 include ../Makefile
diff --git a/npc/obj_dir/Vexample__ALL.cpp b/npc/obj_dir/Vexample__ALL.cpp
deleted file mode 100644
index 553d165..0000000
--- a/npc/obj_dir/Vexample__ALL.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-// DESCRIPTION: Generated by verilator_includer via makefile
-#define VL_INCLUDE_OPT include
-#include "Vexample.cpp"
-#include "Vexample___024root__DepSet_h625e39dc__0.cpp"
-#include "Vexample___024root__DepSet_hcb5acca5__0.cpp"
-#include "Vexample___024root__Slow.cpp"
-#include "Vexample___024root__DepSet_hcb5acca5__0__Slow.cpp"
-#include "Vexample__Syms.cpp"