diff --git a/_constraints b/_constraints
new file mode 100644
index 0000000..fb6a4ef
--- /dev/null
+++ b/_constraints
@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<constraints>
+  <hardware>
+    <memory>
+      <size unit="M">3800</size>
+    </memory>
+  </hardware>
+</constraints>
diff --git a/virtualbox.changes b/virtualbox.changes
index 1af5ac2..618af97 100644
--- a/virtualbox.changes
+++ b/virtualbox.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Apr  8 07:47:34 UTC 2013 - coolo@suse.com
+
+- add a _constraints file to avoid random failures on small workers
+
 -------------------------------------------------------------------
 Sun Mar 31 06:49:28 UTC 2013 - mseben@gmail.com