diff --git a/_config/config.yml b/_config/config.yml
new file mode 100644
index 00000000..b1b1fd8e
--- /dev/null
+++ b/_config/config.yml
@@ -0,0 +1,3 @@
+LeftAndMain:
+  extensions:
+    - LeftAndMainPageIconsExtension
\ No newline at end of file
diff --git a/code/controllers/CMSMain.php b/code/controllers/CMSMain.php
index ede6d08c..ff65c0c3 100644
--- a/code/controllers/CMSMain.php
+++ b/code/controllers/CMSMain.php
@@ -443,47 +443,6 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 		}
 		return $json;
 	}
-	
-	/**
-	 * Include CSS for page icons. We're not using the JSTree 'types' option
-	 * because it causes too much performance overhead just to add some icons.
-	 * 
-	 * @return String CSS 
-	 */
-	public function generatePageIconsCss() {
-		$css = ''; 
-		
-		$classes = ClassInfo::subclassesFor('SiteTree'); 
-		foreach($classes as $class) {
-			$obj = singleton($class); 
-			$iconSpec = $obj->stat('icon'); 
-
-			if(!$iconSpec) continue;
-
-			// Legacy support: We no longer need separate icon definitions for folders etc.
-			$iconFile = (is_array($iconSpec)) ? $iconSpec[0] : $iconSpec;
-
-			// Legacy support: Add file extension if none exists
-			if(!pathinfo($iconFile, PATHINFO_EXTENSION)) $iconFile .= '-file.gif';
-
-			$iconPathInfo = pathinfo($iconFile); 
-			
-			// Base filename 
-			$baseFilename = $iconPathInfo['dirname'] . '/' . $iconPathInfo['filename'];
-			$fileExtension = $iconPathInfo['extension'];
-
-			$selector = ".page-icon.class-$class, li.class-$class > a .jstree-pageicon";
-
-			if(Director::fileExists($iconFile)) {
-				$css .= "$selector { background: transparent url('$iconFile') 0 0 no-repeat; }\n";
-			} else {
-				// Support for more sophisticated rules, e.g. sprited icons
-				$css .= "$selector { $iconFile }\n";
-			}
-		}
-
-		return $css;
-	}
 
 	/**
 	 * Populates an array of classes in the CMS
diff --git a/code/controllers/LeftAndMainPageIconsExtension.php b/code/controllers/LeftAndMainPageIconsExtension.php
new file mode 100644
index 00000000..5b481d7d
--- /dev/null
+++ b/code/controllers/LeftAndMainPageIconsExtension.php
@@ -0,0 +1,55 @@
+<?php
+/**
+ * Extension to include custom page icons
+ * 
+ * @package cms
+ * @subpackage controller
+ */
+class LeftAndMainPageIconsExtension extends Extension {
+
+	public function init() {
+		Requirements::customCSS($this->generatePageIconsCss());
+	}
+
+	/**
+	 * Include CSS for page icons. We're not using the JSTree 'types' option
+	 * because it causes too much performance overhead just to add some icons.
+	 * 
+	 * @return String CSS 
+	 */
+	public function generatePageIconsCss() {
+		$css = ''; 
+		
+		$classes = ClassInfo::subclassesFor('SiteTree'); 
+		foreach($classes as $class) {
+			$obj = singleton($class); 
+			$iconSpec = $obj->stat('icon'); 
+
+			if(!$iconSpec) continue;
+
+			// Legacy support: We no longer need separate icon definitions for folders etc.
+			$iconFile = (is_array($iconSpec)) ? $iconSpec[0] : $iconSpec;
+
+			// Legacy support: Add file extension if none exists
+			if(!pathinfo($iconFile, PATHINFO_EXTENSION)) $iconFile .= '-file.gif';
+
+			$iconPathInfo = pathinfo($iconFile); 
+			
+			// Base filename 
+			$baseFilename = $iconPathInfo['dirname'] . '/' . $iconPathInfo['filename'];
+			$fileExtension = $iconPathInfo['extension'];
+
+			$selector = ".page-icon.class-$class, li.class-$class > a .jstree-pageicon";
+
+			if(Director::fileExists($iconFile)) {
+				$css .= "$selector { background: transparent url('$iconFile') 0 0 no-repeat; }\n";
+			} else {
+				// Support for more sophisticated rules, e.g. sprited icons
+				$css .= "$selector { $iconFile }\n";
+			}
+		}
+
+		return $css;
+	}
+
+}
\ No newline at end of file