diff --git a/core/Object.php b/core/Object.php
old mode 100755
new mode 100644
index 2e49fbd76..24efb1c9b
--- a/core/Object.php
+++ b/core/Object.php
@@ -513,7 +513,7 @@ abstract class Object {
 			user_error(sprintf('Object::add_extension() - Can\'t find extension class for "%s"', $extensionClass), E_USER_ERROR);
 		}
 		
-		if(!ClassInfo::is_subclass_of($extensionClass, 'Extension')) {
+		if(!is_subclass_of($extensionClass, 'Extension')) {
 			user_error(sprintf('Object::add_extension() - Extension "%s" is not a subclass of Extension', $extensionClass), E_USER_ERROR);
 		}
 		
@@ -537,7 +537,7 @@ abstract class Object {
 		self::set_static($class, 'extensions', $extensions);
 		
 		// load statics now for DataObject classes
-		if(ClassInfo::is_subclass_of($class, 'DataObject')) {
+		if(is_subclass_of($class, 'DataObject')) {
 			if(is_subclass_of($extensionClass, 'DataObjectDecorator')) {
 				DataObjectDecorator::load_extra_statics($class, $extension);
 			}
diff --git a/core/control/ContentController.php b/core/control/ContentController.php
old mode 100755
new mode 100644
index a2d14f7bd..afa1de841
--- a/core/control/ContentController.php
+++ b/core/control/ContentController.php
@@ -230,7 +230,7 @@ class ContentController extends Controller {
 		$hasOnes = $this->dataRecord->has_one();
 		if(!$hasOnes) return false;
 		foreach($hasOnes as $hasOneName => $hasOneClass) {
-			if($hasOneClass == 'WidgetArea' || ClassInfo::is_subclass_of($hasOneClass, 'WidgetArea')) {
+			if($hasOneClass == 'WidgetArea' || is_subclass_of($hasOneClass, 'WidgetArea')) {
 				$widgetAreaRelations[] = $hasOneName;
 			}
 		}
diff --git a/core/control/HTTPRequest.php b/core/control/HTTPRequest.php
old mode 100755
new mode 100644
index 6756709f0..c82043ab3
--- a/core/control/HTTPRequest.php
+++ b/core/control/HTTPRequest.php
@@ -348,7 +348,7 @@ class SS_HTTPRequest implements ArrayAccess {
 				if($varRequired && !isset($this->dirParts[$i])) return false;
 				
 				$arguments[$varName] = isset($this->dirParts[$i]) ? $this->dirParts[$i] : null;
-				if($part == '$Controller' && (!ClassInfo::exists($arguments['Controller']) || !ClassInfo::is_subclass_of($arguments['Controller'], 'Controller'))) {
+				if($part == '$Controller' && (!ClassInfo::exists($arguments['Controller']) || !is_subclass_of($arguments['Controller'], 'Controller'))) {
 					return false;
 				}
 				
diff --git a/core/model/Versioned.php b/core/model/Versioned.php
old mode 100755
new mode 100644
index e1d47c242..f564f4a50
--- a/core/model/Versioned.php
+++ b/core/model/Versioned.php
@@ -479,7 +479,7 @@ class Versioned extends DataObjectDecorator {
 	 */
 	function canBeVersioned($table) {
 		return ClassInfo::exists($table) 
-			&& ClassInfo::is_subclass_of($table, 'DataObject')
+			&& is_subclass_of($table, 'DataObject')
 			&& DataObject::has_own_table($table);
 	}