diff --git a/pisi/configfile.py b/pisi/configfile.py
index ff483bad..f868a016 100644
--- a/pisi/configfile.py
+++ b/pisi/configfile.py
@@ -291,3 +291,6 @@ class ConfigurationFile(object):
         for sect in replacement:
             if sect is not None:
                 fp.write(sect.getvalue())
+
+        fp.close()
+