diff --git a/type/__matrix_synapse/manifest b/type/__matrix_synapse/manifest
index bbe0461..64c7c85 100755
--- a/type/__matrix_synapse/manifest
+++ b/type/__matrix_synapse/manifest
@@ -19,7 +19,7 @@
 #
 
 # OS-specific configuration.
-os=$(cat "$__global/explorer/os")
+os=$(cat "${__global:?}/explorer/os")
 
 case "$os" in
 	debian)
@@ -56,7 +56,7 @@ esac
 # Small helper used to get boolean values which can be used as-is in the
 # configuration template.
 get_boolean_for () {
-	if [ -f "$__object/parameter/${1:?}" ]; then
+	if [ -f "${__object:?}/parameter/${1:?}" ]; then
 		echo 'true'
 	else
 		echo 'false'
@@ -293,7 +293,7 @@ esac
 
 # Install OS packages. We have a bit of boilerplate to handle the debian case.
 synapse_req=
-if [ "$os" = "Debian" ]; then
+if [ "$os" = "debian" ]; then
 	require="__apt_source/matrix-org" __package_apt "$synapse_pkg"
 	synapse_req="__package_apt/$synapse_pkg"
 else
@@ -302,7 +302,7 @@ else
 fi
 
 if [ -n "$ENABLE_LDAP_AUTH" ]; then
-	if [ "$os" = "Debian" ]; then
+	if [ "$os" = "debian" ]; then
 		require="__apt_source/matrix-org" __package_apt "$ldap_auth_provider_pkg"
 	else
 		__package "$ldap_auth_provider_pkg"