diff --git a/papyri/ts.py b/papyri/ts.py
index 498e32bd..e4a04aab 100644
--- a/papyri/ts.py
+++ b/papyri/ts.py
@@ -45,11 +45,12 @@
 allowed_adorn = "=-`:.'\"~^_*+#<>"
 
 try:
-    from tree_sitter_languages import get_language, get_parser
+    from tree_sitter_languages import get_parser
 
     # language = get_language('python')
     parser = get_parser("rst")
 except ModuleNotFoundError:
+    assert False
     # replace by tree-sitter-languages once it works See https://github.com/grantjenks/py-tree-sitter-languages/issues/15
     try:
         from tree_sitter import Language, Parser