diff --git a/.config/cargo.toml b/.config/cargo.toml
new file mode 100644
index 000000000..81711ee47
--- /dev/null
+++ b/.config/cargo.toml
@@ -0,0 +1,4 @@
+# On x86_64, we target the x86-64-v2 psABI, as it is a good compromise between
+# modern CPU instructions and compatibility.
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "target-cpu=x86-64-v2"]