diff --git a/src/tests/mod.rs b/src/tests/mod.rs
index 67e46cd..9fcbabf 100644
--- a/src/tests/mod.rs
+++ b/src/tests/mod.rs
@@ -33,6 +33,7 @@ impl ClientData for ClientCounter {
 
 impl<S: Send + 'static> TestServer<S> {
     pub fn new() -> Self {
+        std::env::set_var("XDG_RUNTIME_DIR", "/tmp/");
         let mut display = Display::new().unwrap();
         let socket = ListeningSocket::bind_auto("wl-clipboard-rs-test", 0..).unwrap();