diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index fe3ed9aa..a94d48e8 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -3081,6 +3081,7 @@ Rust:
   color: "#dea584"
   extensions:
   - .rs
+  - .rs.in
   ace_mode: rust
 
 SAS: