diff --git a/CHANGES b/CHANGES
index 9b40d24..7c83487 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2,6 +2,11 @@
 Changes
 =======
 
+1.0.5 (*2020-06-03*)
+====================
+
+- Isso uses current language if not provided in conf.
+
 1.0.4 (*2020-06-03*)
 ====================
 
diff --git a/docs/source/configuration.rst b/docs/source/configuration.rst
index 6cc41ad..7a4b8ac 100644
--- a/docs/source/configuration.rst
+++ b/docs/source/configuration.rst
@@ -72,7 +72,7 @@ If provided, creates external links (e.g. Github) in the top right corner:
            'prefix': '/isso',
            'url': baseurl + '/isso',
            'require_author': "true",
-           'lang': 'fr',
+           'lang': 'fr', # optional, use current language by default
            'reply_to_self': "true",
            'require_author': "true",
            'require_email': "false",
diff --git a/setup.py b/setup.py
index 0a5a127..c85cef9 100644
--- a/setup.py
+++ b/setup.py
@@ -27,7 +27,7 @@ with open("README.rst", "r") as fh:
 
 setup(
     name="sphinx_nervproject_theme",
-    version="1.0.4",
+    version="1.0.5",
     url="https://procrastinator.nerv-project.eu/nerv-project/communication/sphinx_nervproject_theme",
     license="EUPL 1.2",
     author="Kujiu",
diff --git a/sphinx_nervproject_theme/__init__.py b/sphinx_nervproject_theme/__init__.py
index 357b2ab..26c570e 100644
--- a/sphinx_nervproject_theme/__init__.py
+++ b/sphinx_nervproject_theme/__init__.py
@@ -5,7 +5,7 @@ from sphinx.environment.collectors import EnvironmentCollector
 from sphinx import addnodes
 from sphinx.util.osutil import relative_uri
 
-__version__ = (1, 0, 4)
+__version__ = (1, 0, 5)
 
 
 class SimpleTocTreeCollector(EnvironmentCollector):
diff --git a/sphinx_nervproject_theme/layout.html b/sphinx_nervproject_theme/layout.html
index 12dc45d..d5d6fdd 100644
--- a/sphinx_nervproject_theme/layout.html
+++ b/sphinx_nervproject_theme/layout.html
@@ -17,7 +17,7 @@
       <script data-isso="{{ theme_isso['prefix'] }}"
         data-isso-id="{{ pagename }}"
         data-isso-css="false"
-        data-isso-lang="{{ theme_isso['lang'] }}"
+        data-isso-lang="{{ theme_isso.get('lang', language) }}"
         data-isso-reply-to-self="{{ theme_isso['reply_to_self'] }}"
         data-isso-require-author="{{ theme_isso['require_author'] }}"
         data-isso-require-email="{{ theme_isso['require_email'] }}"