diff --git a/ignore/src/types.rs b/ignore/src/types.rs
index 027851b0..0f0da6a0 100644
--- a/ignore/src/types.rs
+++ b/ignore/src/types.rs
@@ -95,6 +95,7 @@ const DEFAULT_TYPES: &'static [(&'static str, &'static [&'static str])] = &[
         "*.C", "*.cc", "*.cpp", "*.cxx",
         "*.h", "*.H", "*.hh", "*.hpp",
     ]),
+    ("cs", &["*.cs"]),
     ("csharp", &["*.cs"]),
     ("css", &["*.css"]),
     ("cython", &["*.pyx"]),