diff --git a/_constraints b/_constraints
index e041fee..baa391d 100644
--- a/_constraints
+++ b/_constraints
@@ -6,9 +6,9 @@
 			<size unit="M">3400</size>
 		</memoryperjob>
 -->
-		<memory>
+		<physicalmemory>
 			<!-- 3400x4 -->
 			<size unit="M">13600</size>
-		</memory>
+		</physicalmemory>
 	</hardware>
 </constraints>