diff --git a/tools/test.py b/tools/test.py
index 738997d58408ce..0a2ca193d719e8 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -70,6 +70,7 @@ def cmp(x, y):  # Python 3
 
 VERBOSE = False
 
+os.umask(0o022)
 os.environ['NODE_OPTIONS'] = ''
 
 # ---------------------------------------------