diff --git a/rust/rustfmt.toml b/rust/rustfmt.toml
new file mode 100644
index 0000000000..4976f5ad9a
--- /dev/null
+++ b/rust/rustfmt.toml
@@ -0,0 +1,2 @@
+# Rust default is 100. Use 80 to bring in line with Suricata C code.
+max_width = 80