diff --git a/pyproject.toml b/pyproject.toml
index 4c050297..f194c681 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,10 +6,10 @@ build-backend = "scikit_build_core.build"
 name = "aare"
 version = "2024.11.28.dev0"
 
-
 [tool.scikit-build]
 cmake.verbose = true
 
 [tool.scikit-build.cmake.define]
 AARE_PYTHON_BINDINGS = "ON"
-AARE_SYSTEM_LIBRARIES = "ON"
\ No newline at end of file
+AARE_SYSTEM_LIBRARIES = "ON"
+AARE_INSTALL_PYTHONEXT = "ON"
\ No newline at end of file