diff --git a/Tonuino/Makefile b/Tonuino/Makefile
index b3cf9270..3b2b47c0 100644
--- a/Tonuino/Makefile
+++ b/Tonuino/Makefile
@@ -77,3 +77,4 @@ check: *.ino *.h
 
 clean:
 	@rm -rf ..arduino*
+	@rm -rf ".pio/build/"