diff --git a/pyproject.toml b/pyproject.toml
index b09b2ad..a1ba466 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "pep517_backend.hooks"  # wraps `setuptools.build_meta`
 
 [tool.local.cythonize]
 # This attr can contain multiple globs
-src = ["src/propcache/*.pyx"]
+src = ["propcache/*.pyx"]
 
 [tool.local.cythonize.env]
 # Env vars provisioned during cythonize call