diff --git a/thefuck/shells/fish.py b/thefuck/shells/fish.py
index f0a1f4f3..538828d7 100644
--- a/thefuck/shells/fish.py
+++ b/thefuck/shells/fish.py
@@ -36,7 +36,7 @@ class Fish(Generic):
                 'end').format(alias_name, alter_history)
 
     @memoize
-    @cache('.config/fish/config.fish', '.config/fish/functions')
+    @cache('~/.config/fish/config.fish', '~/.config/fish/functions')
     def get_aliases(self):
         overridden = self._get_overridden_aliases()
         proc = Popen(['fish', '-ic', 'functions'], stdout=PIPE, stderr=DEVNULL)
diff --git a/thefuck/utils.py b/thefuck/utils.py
index ae56b963..60bc2f5c 100644
--- a/thefuck/utils.py
+++ b/thefuck/utils.py
@@ -208,7 +208,7 @@ def cache(*depends_on):
 
     """
     def _get_mtime(name):
-        path = os.path.join(os.path.expanduser('~'), name)
+        path = Path(name).expanduser().absolute().as_posix()
         try:
             return str(os.path.getmtime(path))
         except OSError: