diff --git a/debian/maintainer_scripts/postinst b/debian/maintainer_scripts/postinst
index 3d2983f184eabebd15974ddc262b2b19cc018713..e1ca6f5b6b467509e33793066b15e19876336dd3 100644
--- a/debian/maintainer_scripts/postinst
+++ b/debian/maintainer_scripts/postinst
@@ -1,3 +1,4 @@
 adduser --system --system balloon
 usermod -G gpio -a balloon
 usermod -G dialout -a balloon
+usermod -G spi -a balloon