diff --git a/resources/lib/Utils.py b/resources/lib/Utils.py
index b65d56d4..37d55267 100644
--- a/resources/lib/Utils.py
+++ b/resources/lib/Utils.py
@@ -184,6 +184,7 @@ def createSources():
                 '</files>\n'
             '</sources>'
         )
+        sources.close()
 
 def pathsubstitution(add=True):