diff --git a/pyproject.toml b/pyproject.toml
index d1ffb3bdef8bda802e80a369587cc6d2157a156f..66d34842fbff613b0a13ca7033bcd81db70497c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,8 +79,7 @@ build-backend = "setuptools.build_meta"
 [tool.setuptools.package-data]
 pystencils = [
     "include/*.h",
-    "backends/cuda_known_functions.txt",
-    "backends/opencl1.1_known_functions.txt",
+    "boundaries/createindexlistcython.pyx"
 ]
 
 [tool.setuptools.packages.find]