diff --git a/unattended-upgrades/kylin-unattended-upgrade b/unattended-upgrades/kylin-unattended-upgrade
index 7ba33d2..8234e6c 100644
--- a/unattended-upgrades/kylin-unattended-upgrade
+++ b/unattended-upgrades/kylin-unattended-upgrade
@@ -159,7 +159,7 @@ def reload_options_config():
     if apt_pkg.config.find_b("APT::Install-Suggests",False) == True:
         apt_pkg.config.clear("APT::Install-Suggests")
     if apt_pkg.config.find("Dir::Etc::sourceparts","")!="":
-        apt_pkg.config["Dir::Etc::sourceparts"]="":
+        apt_pkg.config["Dir::Etc::sourceparts"]=""
     apt_pkg.init_system()
 
 def get_default_version():
diff --git a/unattended-upgrades/kylin-unattended-upgrade-shutdown b/unattended-upgrades/kylin-unattended-upgrade-shutdown
index b29afc3..c8c88c9 100644
--- a/unattended-upgrades/kylin-unattended-upgrade-shutdown
+++ b/unattended-upgrades/kylin-unattended-upgrade-shutdown
@@ -129,7 +129,7 @@ def reload_options_config():
     if apt_pkg.config.find_b("APT::Install-Suggests",False) == True:
         apt_pkg.config.clear("APT::Install-Suggests")
     if apt_pkg.config.find("Dir::Etc::sourceparts","")!="":
-        apt_pkg.config["Dir::Etc::sourceparts"]="":
+        apt_pkg.config["Dir::Etc::sourceparts"]=""
     apt_pkg.init_system()
 
 def is_dpkg_journal_dirty():