diff --git a/tools/build/build.py b/tools/build/build.py
index 9b917410..2b19977b 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -204,7 +204,7 @@ def filter_build(tarinfo):
 def filter_source(tarinfo):
     if re.search('^OxJS/(demos|downloads/|tools/geo/png/icons/)', tarinfo.name):
         return None
-    if re.search('/[\._]', tarinfo.name):
+    if re.search('/\.', tarinfo.name) or re.search('(\.gz|[~])$', tarinfo.name):
         return None
     return tarinfo