diff --git a/mozilla/toolkit/mozapps/update/content/updates.xul b/mozilla/toolkit/mozapps/update/content/updates.xul
index b812b72383e..8cddf554f3f 100755
--- a/mozilla/toolkit/mozapps/update/content/updates.xul
+++ b/mozilla/toolkit/mozapps/update/content/updates.xul
@@ -97,10 +97,15 @@
     <label id="updateName" crop="right"/>
     <separator id="updateNameSep" class="thin"/>
     <description id="upgradeEvangelism">&upgrade.evangelism;</description>
-    <separator id="upgradeEvangelismSep"/>
+    <separator id="upgradeEvangelismSep" flex="1"/>
     <deck id="detailsDeck" flex="1">
       <vbox align="start">
-        <description>&incompatibleChecking.label;</description>
+        <hbox align="start">
+          <image id="incompatibleCheckingThrobber"/>
+          <vbox flex="1">
+            <description>&incompatibleChecking.label;</description>
+          </vbox>
+        </hbox>
       </vbox>
       <vbox>
         <vbox id="moreInfoContent" flex="1">
diff --git a/mozilla/toolkit/themes/pinstripe/mozapps/update/updates.css b/mozilla/toolkit/themes/pinstripe/mozapps/update/updates.css
index 9d3900e9421..69cff7e738f 100755
--- a/mozilla/toolkit/themes/pinstripe/mozapps/update/updates.css
+++ b/mozilla/toolkit/themes/pinstripe/mozapps/update/updates.css
@@ -74,6 +74,12 @@ wizard[currentpageid="updatesfound"] .wizard-page-box {
   margin: 1px 0px 4px 3px;
 }
 
+#incompatibleCheckingThrobber {
+  margin-right: 4px;
+  background-color: transparent;
+  list-style-image: url("chrome://global/skin/icons/loading_16.gif");
+}
+
 #updateMoreInfoURL, #updateMoreInfoURLLabel {
   -moz-margin-start: 0px;
   -moz-margin-end: 0px;
diff --git a/mozilla/toolkit/themes/winstripe/mozapps/update/updates.css b/mozilla/toolkit/themes/winstripe/mozapps/update/updates.css
index 249c0825302..afefed95f0c 100755
--- a/mozilla/toolkit/themes/winstripe/mozapps/update/updates.css
+++ b/mozilla/toolkit/themes/winstripe/mozapps/update/updates.css
@@ -61,6 +61,12 @@ license {
   margin: 1px 5px 4px 3px;
 }
 
+#incompatibleCheckingThrobber {
+  margin-right: 4px;
+  background-color: transparent;
+  list-style-image: url("chrome://global/skin/throbber/Throbber-small.gif");
+}
+
 wizard[currentpageid="updatesfound"] .wizard-button[dlgtype="next"] {
   font-weight: bold;
 }