diff --git a/src/libcore/rand.rs b/src/libcore/rand.rs
index a75a7d056145..dedcf9916701 100644
--- a/src/libcore/rand.rs
+++ b/src/libcore/rand.rs
@@ -284,7 +284,7 @@ mod tests {
 
     #[test]
     #[should_fail]
-    #[ignore(cfg(target_os = "win3"))]
+    #[ignore(cfg(target_os = "win32"))]
     fn gen_int_from_fail() {
         rand::rng().gen_int_range(5, -2);
     }
@@ -300,7 +300,7 @@ mod tests {
 
     #[test]
     #[should_fail]
-    #[ignore(cfg(target_os = "win3"))]
+    #[ignore(cfg(target_os = "win32"))]
     fn gen_uint_range_fail() {
         rand::rng().gen_uint_range(5u, 2u);
     }