diff --git a/micropython.sh b/micropython.sh
index a155194..3854508 100755
--- a/micropython.sh
+++ b/micropython.sh
@@ -1,5 +1,6 @@
 if [ ! -f vendor/micropython/ports/unix/micropython ]; then
-	make micropython-build-unix
+	echo "Run make micropython-build-unix"
+	exit 1
 fi
 
 vendor/micropython/ports/unix/micropython $@