diff --git a/crates/treehouse/src/cli/fix.rs b/crates/treehouse/src/cli/fix.rs
index f0211ee..8a98967 100644
--- a/crates/treehouse/src/cli/fix.rs
+++ b/crates/treehouse/src/cli/fix.rs
@@ -134,7 +134,11 @@ pub fn fix_file(
 
 pub fn fix_file_cli(fix_args: FixArgs) -> anyhow::Result<()> {
     let utf8_filename = fix_args.file.to_string_lossy().into_owned();
-    let file = std::fs::read_to_string(&fix_args.file).context("cannot read file to fix")?;
+    let file = if utf8_filename == "-" {
+        std::io::read_to_string(std::io::stdin().lock()).context("cannot read file from stdin")?
+    } else {
+        std::fs::read_to_string(&fix_args.file).context("cannot read file to fix")?
+    };
 
     let mut treehouse = Treehouse::new();
     let mut diagnostics = vec![];