diff --git a/Effects/terrain-default.eff b/Effects/terrain-default.eff
index ffaf63139..13fc08a0e 100644
--- a/Effects/terrain-default.eff
+++ b/Effects/terrain-default.eff
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PropertyList>
-  <name>default-effect</name>
+  <name>Effects/terrain-default</name>
   <!-- <inherits-from>another-effect</inherits-from> -->
   <parameters>
     <material>
@@ -40,10 +40,21 @@
   </parameters>
   <technique>
     <predicate>
-      <less-equal>
-        <value type="float">2.0</value>
-        <glversion/>
-      </less-equal>
+      <and>
+        <property>/sim/rendering/shader-effects</property>
+        <or>
+          <less-equal>
+            <value type="float">2.0</value>
+            <glversion/>
+          </less-equal>
+          <and>
+            <extension-supported>GL_ARB_shader_objects</extension-supported>
+            <extension-supported>GL_ARB_shading_language_100</extension-supported>
+            <extension-supported>GL_ARB_vertex_shader</extension-supported>
+            <extension-supported>GL_ARB_fragment_shader</extension-supported>
+          </and>
+        </or>
+      </and>
     </predicate>
     <pass>
       <lighting>true</lighting>
diff --git a/preferences.xml b/preferences.xml
index ae021a575..82c0f6d9c 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -112,6 +112,7 @@ Started September 2000 by David Megginson, david@megginson.com
      <enabled type="bool" userarchive="y">true</enabled>
      <debug type="bool" userarchive="y">false</debug>
    </shadows>
+   <shader-effects type="bool" userarchive="y">true</shader-effects>
    <fps-display type="bool" userarchive="y">false</fps-display>
    <on-screen-statistics type="int">0</on-screen-statistics>
    <glide-slope-tunnel type="bool" userarchive="y">false</glide-slope-tunnel>