diff --git a/cowrie/core/fs.py b/cowrie/core/fs.py
index 614d218..1359e26 100644
--- a/cowrie/core/fs.py
+++ b/cowrie/core/fs.py
@@ -313,7 +313,7 @@ class HoneyPotFilesystem(object):
         return os.write(fd, string)
 
     def close(self, fd):
-        if (fd == None):
+        if not fd:
             return True
         if self.tempfiles[fd] is not None:
             shasum = hashlib.sha256(open(self.tempfiles[fd], 'rb').read()).hexdigest()
@@ -330,7 +330,7 @@ class HoneyPotFilesystem(object):
         return os.close(fd)
 
     def lseek(self, fd, offset, whence):
-        if (fd == None):
+        if not fd:
             return True
         return os.lseek(fd, offset, whence)