diff --git a/build/debian/fermentord.postinst b/build/debian/fermentord.postinst
index e49d931..91b35d1 100644
--- a/build/debian/fermentord.postinst
+++ b/build/debian/fermentord.postinst
@@ -5,7 +5,7 @@ set -e
 case "$1" in
 	install)
 		groupadd --system --force w1
-		adduser --system --group --no-create-home --add_extra_groups gpio,w1,spi --home /var/lib/fermentord --shell /sbin/nologin fermentor
+		adduser --system --group --no-create-home --add_extra_groups gpio,w1,i2c --home /var/lib/fermentord --shell /sbin/nologin fermentor
 		;;
 
 	configure)
diff --git a/build/debian/fermentord.rules b/build/debian/fermentord.udev
similarity index 100%
rename from build/debian/fermentord.rules
rename to build/debian/fermentord.udev