diff --git a/pysnooper/__init__.py b/pysnooper/__init__.py
index a7e0464..2135595 100644
--- a/pysnooper/__init__.py
+++ b/pysnooper/__init__.py
@@ -7,7 +7,7 @@ import collections
 __VersionInfo = collections.namedtuple('VersionInfo',
                                        ('major', 'minor', 'micro'))
 
-__version__ = '0.0.23'
+__version__ = '0.0.24'
 __version_info__ = __VersionInfo(*(map(int, __version__.split('.'))))
 
 del collections, __VersionInfo # Avoid polluting the namespace
diff --git a/pysnooper/tracer.py b/pysnooper/tracer.py
index bc4dbd0..c4f4407 100644
--- a/pysnooper/tracer.py
+++ b/pysnooper/tracer.py
@@ -14,6 +14,7 @@ except ImportError:
     import __builtin__ as builtins
 
 from .third_party import six
+from . import utils
 
 ipython_filename_pattern = re.compile('^<ipython-input-([0-9]+)-.*>$')
 
@@ -109,7 +110,7 @@ def get_source_from_frame(frame):
             try:
                 with open(file_name, 'rb') as fp:
                     source = fp.read().splitlines()
-            except (OSError, IOError):
+            except utils.file_reading_errors:
                 pass
     if source is None:
         source = UnavailableSource()
diff --git a/pysnooper/utils.py b/pysnooper/utils.py
index fc6a89c..07d8814 100644
--- a/pysnooper/utils.py
+++ b/pysnooper/utils.py
@@ -30,3 +30,9 @@ class WritableStream(ABC):
             return _check_methods(C, 'write')
         return NotImplemented
 
+
+file_reading_errors = (
+    IOError,
+    OSError,
+    ValueError # IronPython weirdness.
+)