diff --git a/diskcache/core.py b/diskcache/core.py
index 7a3d23b..6c9e282 100644
--- a/diskcache/core.py
+++ b/diskcache/core.py
@@ -232,7 +232,7 @@ def _write(self, full_path, iterator, mode, encoding=None):
 
         for count in range(1, 11):
             with cl.suppress(OSError):
-                os.makedirs(full_dir)
+                os.makedirs(full_dir, 0o700)
 
             try:
                 # Another cache may have deleted the directory before
@@ -444,7 +444,7 @@ def __init__(self, directory=None, timeout=60, disk=Disk, **settings):
 
         if not op.isdir(directory):
             try:
-                os.makedirs(directory, 0o755)
+                os.makedirs(directory, 0o700)
             except OSError as error:
                 if error.errno != errno.EEXIST:
                     raise EnvironmentError(