diff --git a/myhdl/test/toVerilog/Makefile b/myhdl/test/toVerilog/Makefile
index 1ce6fa97..36af8a49 100644
--- a/myhdl/test/toVerilog/Makefile
+++ b/myhdl/test/toVerilog/Makefile
@@ -2,4 +2,4 @@ all:
 	python test_all.py
 
 clean:
-	- rm *.o *.out *.v *.pyc *~
+	- rm *.o *.out *.v *.pyc *~ *.vcd*