diff --git a/crates/test-programs/wasi-tests/src/bin/poll_oneoff_stdio.rs b/crates/test-programs/wasi-tests/src/bin/poll_oneoff_stdio.rs
index 3134c10cf8..7caf508c32 100644
--- a/crates/test-programs/wasi-tests/src/bin/poll_oneoff_stdio.rs
+++ b/crates/test-programs/wasi-tests/src/bin/poll_oneoff_stdio.rs
@@ -68,6 +68,7 @@ unsafe fn test_stdin_read() {
 }
 
 fn writable_subs(h: &HashMap<u64, wasi::Fd>) -> Vec<wasi::Subscription> {
+    println!("writable subs: {:?}", h);
     h.iter()
         .map(|(ud, fd)| wasi::Subscription {
             userdata: *ud,