diff --git a/tests/shells/test_fish.py b/tests/shells/test_fish.py
index 7dd46848..c561352f 100644
--- a/tests/shells/test_fish.py
+++ b/tests/shells/test_fish.py
@@ -19,14 +19,18 @@ class TestFish(object):
         return mock
 
     @pytest.fixture
-    def environ(self, monkeypatch):
-        data = {'TF_OVERRIDDEN_ALIASES': 'cd, ls, man, open'}
-        monkeypatch.setattr('thefuck.shells.fish.os.environ', data)
-        return data
+    def os_environ(self, monkeypatch, key, value):
+        monkeypatch.setattr('os.environ', {key: value})
 
-    @pytest.mark.usefixture('environ')
-    def test_get_overridden_aliases(self, shell, environ):
-        assert shell._get_overridden_aliases() == ['cd', 'ls', 'man', 'open']
+    @pytest.mark.parametrize('key, value', [
+        ('TF_OVERRIDDEN_ALIASES', 'cut,git,sed'),  # legacy
+        ('THEFUCK_OVERRIDDEN_ALIASES', 'cut,git,sed'),
+        ('THEFUCK_OVERRIDDEN_ALIASES', 'cut, git, sed'),
+        ('THEFUCK_OVERRIDDEN_ALIASES', ' cut,\tgit,sed\n'),
+        ('THEFUCK_OVERRIDDEN_ALIASES', '\ncut,\n\ngit,\tsed\r')])
+    def test_get_overridden_aliases(self, shell, os_environ):
+        assert shell._get_overridden_aliases() == {'cd', 'cut', 'git', 'grep',
+                                                   'ls', 'man', 'open', 'sed'}
 
     @pytest.mark.parametrize('before, after', [
         ('cd', 'cd'),
diff --git a/thefuck/shells/fish.py b/thefuck/shells/fish.py
index bc2b2ec7..ab7ed477 100644
--- a/thefuck/shells/fish.py
+++ b/thefuck/shells/fish.py
@@ -7,11 +7,12 @@ from .generic import Generic
 
 class Fish(Generic):
     def _get_overridden_aliases(self):
-        overridden_aliases = os.environ.get('TF_OVERRIDDEN_ALIASES', '').strip()
-        if overridden_aliases:
-            return [alias.strip() for alias in overridden_aliases.split(',')]
-        else:
-            return ['cd', 'grep', 'ls', 'man', 'open']
+        overridden = os.environ.get('THEFUCK_OVERRIDDEN_ALIASES',
+                                    os.environ.get('TF_OVERRIDDEN_ALIASES', ''))
+        default = {'cd', 'grep', 'ls', 'man', 'open'}
+        for alias in overridden.split(','):
+            default.add(alias.strip())
+        return default
 
     def app_alias(self, fuck):
         # It is VERY important to have the variables declared WITHIN the alias