diff --git a/cuda_core/MANIFEST.in b/cuda_core/MANIFEST.in
index 9e86f0a33b..0022e6b85f 100644
--- a/cuda_core/MANIFEST.in
+++ b/cuda_core/MANIFEST.in
@@ -3,6 +3,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
 recursive-include cuda/core *.pyx *.pxd *.pxi *.pyi
-recursive-include cuda/core/_cpp *.cpp *.hpp
+recursive-include cuda/core/_cpp *.cpp *.h *.hpp
 recursive-include cuda/core/_include *.h *.hpp
 include cuda/core/py.typed
diff --git a/cuda_core/pyproject.toml b/cuda_core/pyproject.toml
index 94424d8488..a4b4b40cdf 100644
--- a/cuda_core/pyproject.toml
+++ b/cuda_core/pyproject.toml
@@ -102,7 +102,7 @@ include-package-data = false
 [tool.setuptools.package-data]
 "*" = ["*.pxd", "*.pyi", "py.typed"]
 "cuda.core._include" = ["*.h", "*.hpp"]
-"cuda.core._cpp" = ["*.hpp"]
+"cuda.core._cpp" = ["*.h", "*.hpp"]
 
 [tool.setuptools.dynamic]
 readme = { file = ["DESCRIPTION.rst"], content-type = "text/x-rst" }