diff --git a/stage/build.sh b/stage/build.sh
index 7dd1d55..1f0508d 100755
--- a/stage/build.sh
+++ b/stage/build.sh
@@ -112,7 +112,7 @@ fi
 		source ./env/bin/activate
 	fi
 	pip install ../ -U --no-cache-dir
-	yes || pip uninstall pymavlink
+	yes | pip uninstall pymavlink
 	pip install "pymavlink<2.0"
 
 	python eepromgen.py
diff --git a/stage/clean.sh b/stage/clean.sh
new file mode 100755
index 0000000..f1c9e8f
--- /dev/null
+++ b/stage/clean.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+rm -rf build
+rm -rf publish