diff --git a/src/main.rs b/src/main.rs
index a34e879..e49d48c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2932,7 +2932,7 @@ mod tests {
         // goto for killing xephyr no matter what
         let ok = loop {
             unsafe {
-                let xcon = match Connection::connect(None) {
+                let xcon = match Connection::connect(Some(":1.0")) {
                     Ok((xcon, _)) => xcon,
                     Err(e) => {
                         eprintln!("rwm: cannot get xcb connection: {e:?}");