diff --git a/parso/_compatibility.py b/parso/_compatibility.py
index 4c966d6..f1f0b0f 100644
--- a/parso/_compatibility.py
+++ b/parso/_compatibility.py
@@ -44,20 +44,6 @@ def u(string):
     return string
 
 
-try:
-    # Python 3.3+
-    FileNotFoundError = FileNotFoundError
-except NameError:
-    # Python 2.7 (both IOError + OSError)
-    FileNotFoundError = EnvironmentError
-try:
-    # Python 3.3+
-    PermissionError = PermissionError
-except NameError:
-    # Python 2.7 (both IOError + OSError)
-    PermissionError = EnvironmentError
-
-
 def utf8_repr(func):
     """
     ``__repr__`` methods in Python 2 don't allow unicode objects to be
diff --git a/parso/cache.py b/parso/cache.py
index 8644423..d9be412 100644
--- a/parso/cache.py
+++ b/parso/cache.py
@@ -14,7 +14,7 @@ try:
 except:
     import pickle
 
-from parso._compatibility import FileNotFoundError, PermissionError, scandir
+from parso._compatibility import scandir
 from parso.file_io import FileIO
 
 LOG = logging.getLogger(__name__)
diff --git a/parso/file_io.py b/parso/file_io.py
index 34b41ec..a9fcfe3 100644
--- a/parso/file_io.py
+++ b/parso/file_io.py
@@ -1,5 +1,4 @@
 import os
-from parso._compatibility import FileNotFoundError
 
 
 class FileIO(object):
@@ -19,8 +18,7 @@ class FileIO(object):
         """
         try:
             return os.path.getmtime(self.path)
-        except OSError:
-            # Might raise FileNotFoundError, OSError for Python 2
+        except FileNotFoundError:
             return None
 
     def _touch(self):
diff --git a/parso/grammar.py b/parso/grammar.py
index 6233005..fd30f29 100644
--- a/parso/grammar.py
+++ b/parso/grammar.py
@@ -1,7 +1,7 @@
 import hashlib
 import os
 
-from parso._compatibility import FileNotFoundError, is_pypy
+from parso._compatibility import is_pypy
 from parso.pgen2 import generate_grammar
 from parso.utils import split_lines, python_bytes_to_unicode, parse_version_string
 from parso.python.diff import DiffParser
diff --git a/test/test_cache.py b/test/test_cache.py
index e1a0a9e..e572527 100644
--- a/test/test_cache.py
+++ b/test/test_cache.py
@@ -13,7 +13,7 @@ from parso.cache import (_CACHED_FILE_MAXIMUM_SURVIVAL, _VERSION_TAG,
                          _load_from_file_system, _NodeCacheItem,
                          _remove_cache_and_update_lock, _save_to_file_system,
                          load_module, parser_cache, try_to_save_module)
-from parso._compatibility import is_pypy, PermissionError
+from parso._compatibility import is_pypy
 from parso import load_grammar
 from parso import cache
 from parso import file_io