diff --git a/src/test/run-pass/extern-pass-TwoU64s-ref.rs b/src/test/run-pass/extern-pass-TwoU64s-ref.rs
index 1937c366831f..ed9871b5edb2 100644
--- a/src/test/run-pass/extern-pass-TwoU64s-ref.rs
+++ b/src/test/run-pass/extern-pass-TwoU64s-ref.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // Test that we ignore modes when calling extern functions.
+// xfail-fast #9205
 
 #[deriving(Eq)]
 struct TwoU64s {
diff --git a/src/test/run-pass/extern-pass-TwoU64s.rs b/src/test/run-pass/extern-pass-TwoU64s.rs
index b543099b3b8f..772970ce8a33 100644
--- a/src/test/run-pass/extern-pass-TwoU64s.rs
+++ b/src/test/run-pass/extern-pass-TwoU64s.rs
@@ -14,6 +14,7 @@
 // xfail-fast This works standalone on windows but not with check-fast.
 // possibly because there is another test that uses this extern fn but gives it
 // a different signature
+// xfail-fast #9205
 
 #[deriving(Eq)]
 struct TwoU64s {
diff --git a/src/test/run-pass/extern-return-TwoU64s.rs b/src/test/run-pass/extern-return-TwoU64s.rs
index 4dc31d715260..7fcbe3670fc0 100644
--- a/src/test/run-pass/extern-return-TwoU64s.rs
+++ b/src/test/run-pass/extern-return-TwoU64s.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast #9205
+
 struct TwoU64s {
     one: u64, two: u64
 }
diff --git a/src/test/run-pass/struct-return.rs b/src/test/run-pass/struct-return.rs
index 3f63902eb319..a1f5a2392b15 100644
--- a/src/test/run-pass/struct-return.rs
+++ b/src/test/run-pass/struct-return.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-fast #9205
+
 pub struct Quad { a: u64, b: u64, c: u64, d: u64 }
 pub struct Floats { a: f64, b: u8, c: f64 }