diff --git a/etstool.py b/etstool.py
index 02ca3a35f..9f5b615a9 100644
--- a/etstool.py
+++ b/etstool.py
@@ -92,7 +92,7 @@
     "enthought_sphinx_theme",
     "flake8",
     "flake8_ets",
-    "lark-parser",
+    "lark_parser",
     "mypy",
     "numpy",
     "Sphinx",