diff --git a/src/syntax/src/file_types.zig b/src/syntax/src/file_types.zig
index 30b68ac..de1a26d 100644
--- a/src/syntax/src/file_types.zig
+++ b/src/syntax/src/file_types.zig
@@ -116,7 +116,7 @@ pub const gleam = .{
     .extensions = .{ "gleam" },
     .comment = "//",
     .language_server = .{"gleam", "lsp"},
-    .formatter = .{"gleam", "format"},
+    .formatter = .{"gleam", "format", "--stdin"},
 };
 
 pub const go = .{