diff --git a/core/src/lib.rs b/core/src/lib.rs
index eda4c3c..53e75a1 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -2,6 +2,7 @@
 #![feature(extract_if)]
 #![feature(hash_extract_if)]
 #![feature(proc_macro_span)]
+#![feature(iter_repeat_n)]
 
 pub mod common;
 pub mod compiler;
diff --git a/etc/scallopy/pyproject.toml b/etc/scallopy/pyproject.toml
new file mode 100644
index 0000000..3bc67a2
--- /dev/null
+++ b/etc/scallopy/pyproject.toml
@@ -0,0 +1,4 @@
+[build-system]
+requires = ["maturin>=1.5,<2.0"]
+build-backend = "maturin"
+