diff --git a/_constraints b/_constraints
index 4464274..a2250c0 100644
--- a/_constraints
+++ b/_constraints
@@ -1,5 +1,8 @@
 <constraints>
   <hardware>
+    <cpu>
+      <flag>sse2</flag>
+    </cpu>
     <memory>
       <size unit="M">6000</size>
     </memory>