diff --git a/_constraints b/_constraints
index 7c2ed2a..63bed34 100644
--- a/_constraints
+++ b/_constraints
@@ -4,5 +4,8 @@
     <disk>
       <size unit="G">17</size>
     </disk>
+    <physicalmemory>
+      <size unit="G">6</size>
+    </physicalmemory>
   </hardware>
 </constraints>