diff --git a/README.md b/README.md
index 4d80515..0d10011 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,8 @@
 
 Simple program that runs test cases specified in an autograding.json file and reports results. Useful for previewing how GitHub will run your autograder and project.
 
-Currently this relies on you setting `SHELL` in your environment meaning Windows won't work.
+This will only work on Linux as it uses `bash`. Also most GitHub auto-graders runs on the Ubuntu runner image so the commands
+are gonna be Linux specific anyway.
 
 ## Usage
 
diff --git a/src/runner.rs b/src/runner.rs
index df2c5a2..2f9cb4a 100644
--- a/src/runner.rs
+++ b/src/runner.rs
@@ -9,8 +9,7 @@ use anyhow::{anyhow, Result};
 use wait_timeout::ChildExt;
 
 pub fn setup_phase(cmd: &str) -> Result<()> {
-    let shell = env::var("SHELL").map_err(|_| anyhow!("SHELL environment variable not set"))?;
-    let mut child = Command::new(shell)
+    let mut child = Command::new("bash")
         .arg("-c")
         .arg(cmd)
         .spawn()