diff --git a/subiquity/curtin.py b/subiquity/curtin.py
index 6f2b756a..84732e8d 100644
--- a/subiquity/curtin.py
+++ b/subiquity/curtin.py
@@ -153,7 +153,6 @@ def curtin_write_network_config(netplan_config):
     with open(CURTIN_NETWORK_CONFIG_FILE, 'w') as conf:
         conf.write(datestr)
         conf.write(curtin_config)
-        conf.close()
 
 
 def curtin_find_curtin():