diff --git a/_constraints b/_constraints
index b75d7c1..1de74e3 100644
--- a/_constraints
+++ b/_constraints
@@ -5,4 +5,5 @@
       <size unit="M">1500</size>
     </memory>
   </hardware>
+  <sandbox>kvm</sandbox>
 </constraints>
diff --git a/glibc-testsuite.changes b/glibc-testsuite.changes
index 66dc1e4..4ce8b03 100644
--- a/glibc-testsuite.changes
+++ b/glibc-testsuite.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jan 31 09:09:06 UTC 2013 - coolo@suse.com
+
+- looks like testsuite runs only on kvm, so add _constraint
+  (actually it does not build on xen, but I can't constraint that)
+
 -------------------------------------------------------------------
 Thu Jan 24 16:33:04 UTC 2013 - schwab@suse.de
 
diff --git a/glibc-utils.changes b/glibc-utils.changes
index 66dc1e4..4ce8b03 100644
--- a/glibc-utils.changes
+++ b/glibc-utils.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jan 31 09:09:06 UTC 2013 - coolo@suse.com
+
+- looks like testsuite runs only on kvm, so add _constraint
+  (actually it does not build on xen, but I can't constraint that)
+
 -------------------------------------------------------------------
 Thu Jan 24 16:33:04 UTC 2013 - schwab@suse.de
 
diff --git a/glibc.changes b/glibc.changes
index 66dc1e4..4ce8b03 100644
--- a/glibc.changes
+++ b/glibc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jan 31 09:09:06 UTC 2013 - coolo@suse.com
+
+- looks like testsuite runs only on kvm, so add _constraint
+  (actually it does not build on xen, but I can't constraint that)
+
 -------------------------------------------------------------------
 Thu Jan 24 16:33:04 UTC 2013 - schwab@suse.de