diff --git a/tools/build/build.py b/tools/build/build.py
index 9cf10f68..f11836ca 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -227,7 +227,7 @@ def filter_source(tarinfo):
     # FIXME: demos and tests should be removed anyway
     if re.search('^OxJS/(demos|downloads/|tests|tools/geo/png/icons/)', tarinfo.name):
         return None
-    if re.search('/[._]', tarinfo.name) or re.search('(\.gz|[~])$', tarinfo.name):
+    if re.search('/[._]', tarinfo.name) or re.search('~$', tarinfo.name):
         return None
     return tarinfo