diff --git a/plugins/Activity/ActivityPlugin.php b/plugins/Activity/ActivityPlugin.php
index 5801c194a6..0c7700d787 100644
--- a/plugins/Activity/ActivityPlugin.php
+++ b/plugins/Activity/ActivityPlugin.php
@@ -47,7 +47,7 @@ if (!defined('STATUSNET')) {
 class ActivityPlugin extends Plugin
 {
     const VERSION = '0.1';
-    const SOURCE  = 'system';
+    const SOURCE  = 'activity';
 
     // Flags to switch off certain activity notices
     public $StartFollowUser = true;
diff --git a/theme/base/css/display.css b/theme/base/css/display.css
index f5638e58ab..75e48c0958 100644
--- a/theme/base/css/display.css
+++ b/theme/base/css/display.css
@@ -1502,16 +1502,16 @@ content:'☠';
 font-size:150%;
 }
 
-#content .notice-source-system div.entry-title, .notice-source-system div.entry-content {
+#content .notice-source-activity div.entry-title, .notice-source-activity div.entry-content {
     margin-left: 0;
 } 
 
-#content .notice-source-system div.entry-title {
+#content .notice-source-activity div.entry-title {
     font-style: italic;
     min-height: 0;
 }
 
-#content .notice-source-system .notice div.entry-title {
+#content .notice-source-activity .notice div.entry-title {
     font-style: normal;
 }