diff --git a/tests/it_can_read_write.rs b/tests/it_can_read_write.rs
index 89bb259..4a3ce09 100644
--- a/tests/it_can_read_write.rs
+++ b/tests/it_can_read_write.rs
@@ -29,8 +29,11 @@ fn it_can_read_write() {
         let _ = master.write("exit\n".to_string().as_bytes());
     } else {
         let mut cmd = Command::new("bash");
+        cmd.arg("--rcfile").arg("/dev/null");
         cmd.env_clear();
 
+        cmd.env("PS1", "");
+
         // On macOS, silence the deprecation warning;
         // https://github.com/apple-oss-distributions/bash/blob/e86b2aa8e37a31f8fce56366d1abaf08a3fac7d2/bash-3.2/shell.c#L760-L765
         #[cfg(target_os = "macos")]