diff --git a/mt940/__about__.py b/mt940/__about__.py
index 4f70bd5..6397d4d 100644
--- a/mt940/__about__.py
+++ b/mt940/__about__.py
@@ -6,7 +6,7 @@
 statistics and manipulation.
 '''.strip().split())
 __email__ = 'wolph@wol.ph'
-__version__ = '4.13.0'
+__version__ = '4.13.1'
 __license__ = 'BSD'
 __copyright__ = 'Copyright 2015 Rick van Hattem (wolph)'
 __url__ = 'https://github.com/WoLpH/mt940'
diff --git a/mt940/parser.py b/mt940/parser.py
index 46878a9..fa5ae5d 100644
--- a/mt940/parser.py
+++ b/mt940/parser.py
@@ -40,9 +40,15 @@ def parse(src, encoding=None):
     :rtype: Transactions
     '''
 
+    def safe_is_file(filename):
+        try:
+            return os.path.isfile(src)
+        except ValueError:  # pragma: no cover
+            return False
+
     if hasattr(src, 'read'):  # pragma: no branch
         data = src.read()
-    elif os.path.isfile(src):
+    elif safe_is_file(src):
         return parse(open(src, 'rb').read())
     elif hasattr(src, 'decode'):
         exception = None