diff --git a/Materials/regions/global-summer.xml b/Materials/regions/global-summer.xml
index 6854b0fa9..a9f493fab 100644
--- a/Materials/regions/global-summer.xml
+++ b/Materials/regions/global-summer.xml
@@ -664,7 +664,7 @@
     <rolling-friction>0.1</rolling-friction>
     <bumpiness>0.7</bumpiness>
     <load-resistance>1e30</load-resistance>
-    <object-group include="Materials/base/farm-buildings.xml"/>
+    <object-group include="Materials/base/us-farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
     <tree-texture>Trees/mixed-alt.png</tree-texture>
     <tree-varieties>8</tree-varieties>
@@ -695,7 +695,7 @@
     <rolling-friction>0.3</rolling-friction>
     <bumpiness>0.6</bumpiness>
     <load-resistance>1e30</load-resistance>
-    <object-group include="Materials/base/farm-buildings.xml"/>
+    <object-group include="Materials/base/us-farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
     <tree-texture>Trees/mixed-alt.png</tree-texture>
     <tree-varieties>8</tree-varieties>
@@ -724,7 +724,7 @@
     <bumpiness>0.6</bumpiness>
     <load-resistance>1e30</load-resistance>
     <light-coverage>2000000.0</light-coverage>
-    <object-group include="Materials/base/farm-buildings.xml"/>
+    <object-group include="Materials/base/us-farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
     <tree-texture>Trees/mixed-alt.png</tree-texture>
     <tree-varieties>8</tree-varieties>
@@ -744,7 +744,7 @@
     <bumpiness>0.6</bumpiness>
     <load-resistance>1e30</load-resistance>
     <light-coverage>2000000.0</light-coverage>
-    <object-group include="Materials/base/farm-buildings.xml"/>
+    <object-group include="Materials/base/us-farm-buildings.xml"/>
     <wood-coverage>10000.0</wood-coverage>
     <tree-texture>Trees/mixed-alt.png</tree-texture>
     <tree-varieties>8</tree-varieties>