diff --git a/patacrep/build.py b/patacrep/build.py
index b22af9ce..a3ce2984 100644
--- a/patacrep/build.py
+++ b/patacrep/build.py
@@ -8,7 +8,9 @@ import threading
 import os.path
 from subprocess import Popen, PIPE, call, check_call
 
-from patacrep import authors, content, errors, files, utils
+import yaml
+
+from patacrep import authors, content, encoding, errors, files, pkg_datapath, utils
 from patacrep.index import process_sxd
 from patacrep.templates import TexBookRenderer, iter_bookoptions
 from patacrep.songs import DataSubpath, DEFAULT_CONFIG
@@ -42,11 +44,22 @@ class Songbook(object):
     def __init__(self, raw_songbook, basename):
         super().__init__()
         self.config = raw_songbook
-        utils.validate_config_schema(raw_songbook)
+        self.validate_config_schema(raw_songbook)
         self.basename = basename
         # Some special keys have their value processed.
         self._set_datadir()
 
+    @staticmethod
+    def validate_config_schema(raw_songbook):
+        """
+        Check that the songbook config respects the excepted songbook schema
+        """
+        schema_path = pkg_datapath('templates', 'songbook_schema.yml')
+        with encoding.open_read(schema_path) as schema_file:
+            schema_struct = yaml.load(schema_file)
+        schema_struct = utils.remove_keys(schema_struct, ['_description'])
+        utils.validate_yaml_schema(raw_songbook, schema_struct)
+
     def _set_datadir(self):
         """Set the default values for datadir"""
         abs_datadir = []
diff --git a/patacrep/utils.py b/patacrep/utils.py
index 58dd30ab..a4a4feeb 100644
--- a/patacrep/utils.py
+++ b/patacrep/utils.py
@@ -2,7 +2,7 @@
 
 from collections import UserDict
 
-from patacrep import encoding, errors, pkg_datapath, Rx
+from patacrep import errors, Rx
 
 class DictOfDict(UserDict):
     """Dictionary, with a recursive :meth:`update` method.
@@ -94,19 +94,6 @@ def remove_keys(data, keys=None, recursive=True):
         return [remove_keys(elt, keys, True) for elt in data]
     return data
 
-def validate_config_schema(config):
-    """
-    Check that the songbook config respects the excepted songbook schema
-    """
-    data = config.copy()
-
-    schema_path = pkg_datapath('templates', 'songbook_schema.yml')
-    import yaml
-    with encoding.open_read(schema_path) as schema_file:
-        schema_struct = yaml.load(schema_file)
-    schema_struct = remove_keys(schema_struct, ['_description'])
-    validate_yaml_schema(data, schema_struct)
-
 def validate_yaml_schema(data, schema):
     """
     Check that the data respects the schema