diff --git a/pyproject.toml b/pyproject.toml
index eaeafb90..b0608a58 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,9 +34,9 @@ classifiers = [
 urls = { Changelog = "https://github.com/pycqa/isort/blob/main/CHANGELOG.md" }
 include = [
     { path = "tests", format = "sdist" },
-    { path = "ACKNOWLEDGEMENTS.md" },
-    { path = "CHANGELOG.md" },
-    { path = "LICENSE" },
+    { path = "ACKNOWLEDGEMENTS.md", format = "sdist" },
+    { path = "CHANGELOG.md", format = "sdist" },
+    { path = "LICENSE", format = "sdist" },
 ]
 
 [tool.poetry.dependencies]