diff --git a/_constraints b/_constraints
index be78a95..bd07362 100644
--- a/_constraints
+++ b/_constraints
@@ -6,7 +6,7 @@
 <constraints>
 	<hardware>
 		<disk>
-			<size unit="G">16</size>
+			<size unit="G">4</size>
 		</disk>
 		<physicalmemory>
 			<size unit="G">11</size>
@@ -25,4 +25,14 @@
 			</physicalmemory>
 		</hardware>
 	</overwrite>
+	<overwrite>
+		<conditions>
+			<arch>x86_64</arch>
+		</conditions>
+		<hardware>
+			<disk>
+				<size unit="G">16</size>
+			</disk>
+		</hardware>
+	</overwrite>
 </constraints>