diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index b6438bd..b01c3cb 100644
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -178,6 +178,9 @@
 
 def ismount(path):
     """Test whether a path is a mount point"""
+    if islink(path):
+        # A symlink can never be a mount point
+        return False
     try:
         s1 = os.lstat(path)
         s2 = os.lstat(join(path, '..'))