2 files changed, 6 insertions, 0 deletions
diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index 667f5c52de..e9f4251846 100644
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -200,6 +200,9 @@ def samestat(s1, s2):
 
 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)
         if isinstance(path, bytes):
diff --git a/Misc/NEWS b/Misc/NEWS
index 0fa78458f5..94bf2b9de0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,6 +29,9 @@ Extensions
 Library
 -------
 
+- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
+  across devices.
+
 - Issue #8826: Properly load old-style "expires" attribute in http.cookies.
 
 - Issue #1690103: Fix initial namespace for code run with trace.main().