diff --git a/RaspberryPiPico/build.sh b/RaspberryPiPico/build.sh
index 897ba28..db82a76 100755
--- a/RaspberryPiPico/build.sh
+++ b/RaspberryPiPico/build.sh
@@ -1,2 +1,4 @@
+#!/bin/sh
+
 PICO_SDK_PATH=~/pico-sdk/ cmake .
 make