diff --git a/src/stl/posix.rs b/src/stl/posix.rs
index d428846..481f1c3 100644
--- a/src/stl/posix.rs
+++ b/src/stl/posix.rs
@@ -471,12 +471,11 @@ pub fn load_posix_shell(syms: &mut SymTable, shell_state: Rc<RefCell<ShellState>
         ).expect("couldn't take terminal from owning process")
     }
 
-    if let Err(e) = unistd::setpgid(
-        unistd::Pid::from_raw(0),
-        unistd::Pid::from_raw(0)
-    ) {
-        panic!("couldn't set PGID: {}", e)
-    };
+    if pid != pgid {
+        if let Err(e) = unistd::setpgid(pid, pid) {
+            panic!("couldn't set PGID: {}", e)
+        };
+    }
 
     if let Err(e) = unistd::tcsetpgrp(0, pid) {
         panic!("couldn't grab terminal: {}", e)