diff --git a/songbook_core/build.py b/songbook_core/build.py
index 5e26a720..6a2a01e6 100755
--- a/songbook_core/build.py
+++ b/songbook_core/build.py
@@ -75,7 +75,7 @@ class Songbook(object):
         abs_datadir.append(__DATADIR__)
 
         self.config['datadir'] = abs_datadir
-        self.config['songdir'] = [os.path.join(path, 'songs') for path in self.config['datadir']]
+        self.config['_songdir'] = [os.path.join(path, 'songs') for path in self.config['datadir']]
 
     def build_config(self, from_templates):
         config = DEFAULT_CONFIG
diff --git a/songbook_core/content/cwd.py b/songbook_core/content/cwd.py
index 6c76d8c2..a9c5053e 100644
--- a/songbook_core/content/cwd.py
+++ b/songbook_core/content/cwd.py
@@ -6,10 +6,10 @@ import os
 from songbook_core.content import process_content
 
 def parse(keyword, config, argument, contentlist):
-    config['songdir'] = (
+    config['_songdir'] = (
             [os.path.relpath(argument)] +
-            [os.path.join(path, argument) for path in config['songdir']] +
-            config['songdir']
+            [os.path.join(path, argument) for path in config['_songdir']] +
+            config['_songdir']
             )
     return process_content(contentlist, config)
 
diff --git a/songbook_core/content/song.py b/songbook_core/content/song.py
index 38948e28..fbaae8d7 100644
--- a/songbook_core/content/song.py
+++ b/songbook_core/content/song.py
@@ -35,9 +35,9 @@ class SongRenderer(Content, Song):
 
 def parse(keyword, argument, contentlist, config):
     if 'languages' not in config:
-        config['languages'] = set()
+        config['_languages'] = set()
     songlist = []
-    for songdir in config['songdir']:
+    for songdir in config['_songdir']:
         if contentlist:
             break
         contentlist = [
@@ -47,12 +47,12 @@ def parse(keyword, argument, contentlist, config):
                 ]
     for elem in contentlist:
         before = len(songlist)
-        for songdir in config['songdir']:
+        for songdir in config['_songdir']:
             for filename in glob.iglob(os.path.join(songdir, elem)):
                 LOGGER.debug('Parsing file "{}"…'.format(filename))
                 song = SongRenderer(filename, config)
                 songlist.append(song)
-                config["languages"].update(song.languages)
+                config["_languages"].update(song.languages)
             if len(songlist) > before:
                 break
         if len(songlist) == before:
diff --git a/songbook_core/data/templates/songs.tex b/songbook_core/data/templates/songs.tex
index f81db077..7e51e0bb 100644
--- a/songbook_core/data/templates/songs.tex
+++ b/songbook_core/data/templates/songs.tex
@@ -70,7 +70,7 @@
 (* block songbookpreambule *)
    (( super() ))
 
-   (* for lang in languages *)
+   (* for lang in _languages *)
    \PassOptionsToPackage{((lang))}{babel}
    (* endfor *)
    \usepackage[((lang))]{babel}