diff --git a/src/test/run-pass/tag-align-dyn-u64.rs b/src/test/run-pass/tag-align-dyn-u64.rs
index 0fdf4e019a775..a09ee23f1478a 100644
--- a/src/test/run-pass/tag-align-dyn-u64.rs
+++ b/src/test/run-pass/tag-align-dyn-u64.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test
+
 enum a_tag<A> {
     a_tag(A)
 }
diff --git a/src/test/run-pass/tag-align-dyn-variants.rs b/src/test/run-pass/tag-align-dyn-variants.rs
index 96921f2a065c2..cd94bd30c21e0 100644
--- a/src/test/run-pass/tag-align-dyn-variants.rs
+++ b/src/test/run-pass/tag-align-dyn-variants.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test
+
 enum a_tag<A,B> {
     varA(A),
     varB(B)
diff --git a/src/test/run-pass/tag-align-u64.rs b/src/test/run-pass/tag-align-u64.rs
index 56d384e5fdb76..ea60f389663cf 100644
--- a/src/test/run-pass/tag-align-u64.rs
+++ b/src/test/run-pass/tag-align-u64.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test
 
 enum a_tag {
     a_tag(u64)