diff --git a/tests/compile-fail/data_race/read_write_race.rs b/tests/compile-fail/data_race/read_write_race.rs
index ece99b4a87a..6a5f3f7d207 100644
--- a/tests/compile-fail/data_race/read_write_race.rs
+++ b/tests/compile-fail/data_race/read_write_race.rs
@@ -1,3 +1,4 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
 
 use std::thread::spawn;
 
diff --git a/tests/compile-fail/data_race/relax_acquire_race.rs b/tests/compile-fail/data_race/relax_acquire_race.rs
index cc96083546a..753d30b8f57 100644
--- a/tests/compile-fail/data_race/relax_acquire_race.rs
+++ b/tests/compile-fail/data_race/relax_acquire_race.rs
@@ -1,3 +1,4 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
 
 use std::thread::spawn;
 use std::sync::atomic::{AtomicUsize, Ordering};
diff --git a/tests/compile-fail/data_race/release_seq_race.rs b/tests/compile-fail/data_race/release_seq_race.rs
index 8b3ffbcd9dd..44360f70d5d 100644
--- a/tests/compile-fail/data_race/release_seq_race.rs
+++ b/tests/compile-fail/data_race/release_seq_race.rs
@@ -1,3 +1,4 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
 // compile-flags: -Zmiri-disable-isolation
 
 use std::thread::{spawn, sleep};
diff --git a/tests/compile-fail/data_race/rmw_race.rs b/tests/compile-fail/data_race/rmw_race.rs
index 9c31c79ebf1..9dfa2751d58 100644
--- a/tests/compile-fail/data_race/rmw_race.rs
+++ b/tests/compile-fail/data_race/rmw_race.rs
@@ -1,3 +1,4 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
 
 use std::thread::spawn;
 use std::sync::atomic::{AtomicUsize, Ordering};
diff --git a/tests/compile-fail/data_race/write_write_race.rs b/tests/compile-fail/data_race/write_write_race.rs
index 22caf5f0f7f..0c46e5c9251 100644
--- a/tests/compile-fail/data_race/write_write_race.rs
+++ b/tests/compile-fail/data_race/write_write_race.rs
@@ -1,3 +1,4 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
 
 use std::thread::spawn;
 
diff --git a/tests/run-pass/concurrency/data_race.rs b/tests/run-pass/concurrency/data_race.rs
index bc4a4e30e89..40a7c162a0c 100644
--- a/tests/run-pass/concurrency/data_race.rs
+++ b/tests/run-pass/concurrency/data_race.rs
@@ -1,3 +1,6 @@
+// ignore-windows: Concurrency on Windows is not supported yet.
+
+
 use std::sync::atomic::{AtomicUsize, fence, Ordering};
 use std::thread::spawn;