diff --git a/thefuck/shells.py b/thefuck/shells.py
index 10f56a8..973641d 100644
--- a/thefuck/shells.py
+++ b/thefuck/shells.py
@@ -151,18 +151,18 @@ class Fish(Generic):
 
     def app_alias(self, fuck):
         return ('function {0} -d "Correct your previous console command"\n'
-                '    set -l exit_code $status\n'
-                '    set -x TF_ALIAS {0}\n'
-                '    set -l fucked_up_command $history[1]\n'
-                '    thefuck $fucked_up_command | read -l unfucked_command\n'
-                '    if [ "$unfucked_command" != "" ]\n'
-                '        eval $unfucked_command\n'
-                '        if test $exit_code -ne 0\n'
-                '            history --delete $fucked_up_command\n'
-                '            history --merge ^ /dev/null\n'
-                '            return 0\n'
-                '        end\n'
+                '  set -l exit_code $status\n'
+                '  set -x TF_ALIAS {0}\n'
+                '  set -l fucked_up_command $history[1]\n'
+                '  thefuck $fucked_up_command | read -l unfucked_command\n'
+                '  if [ "$unfucked_command" != "" ]\n'
+                '    eval $unfucked_command\n'
+                '    if test $exit_code -ne 0\n'
+                '      history --delete $fucked_up_command\n'
+                '      history --merge ^ /dev/null\n'
+                '      return 0\n'
                 '    end\n'
+                '  end\n'
                 'end').format(fuck)
 
     @memoize