diff --git a/Makefile b/Makefile
index 9ad7601..acfaab7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,7 @@
-build:
+build: clean
 	misc/script/build
 
+clean:
+	rm -rf bin
+
 .PHONY: build
\ No newline at end of file
diff --git a/misc/script/build b/misc/script/build
index 5722856..1b6d631 100755
--- a/misc/script/build
+++ b/misc/script/build
@@ -18,4 +18,4 @@ do
     fi
 done
 
-(cd bin && sha256sum *.{tar.gz,zip} > werther_checksums.txt)
\ No newline at end of file
+(cd bin && sha256sum *.{tar.gz,zip} > werther_checksums.txt || exit 0)
\ No newline at end of file