diff --git a/MANIFEST.in b/MANIFEST.in
index 4bc4264..309d4fc 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -27,6 +27,7 @@ include  python/CMakeLists.txt
 include  python/_cosmo_bispectrum.cpp
 include  python/_cosmo_cic.pyx
 include  python/_cosmo_power.pyx
+include  python/_cosmomath.pyx
 include  python/_cosmotool.pyx
 include  python/_fast_interp.pyx
 include  python/_project.pyx
diff --git a/pyproject.toml b/pyproject.toml
index 890c3fc..32826dd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,4 @@
 [build-system]
-requires = ["setuptools"]
+requires = ["setuptools","wheel","cython"]
 build-backend = "setuptools.build_meta"