diff --git a/core/control/Director.php b/core/control/Director.php
index 16087abba..5fe261a92 100644
--- a/core/control/Director.php
+++ b/core/control/Director.php
@@ -725,7 +725,7 @@ class Director {
 	 */
 	static function set_environment_type($et) {
 		if($et != 'dev' && $et != 'test' && $et != 'live') {
-			Debug::backtrace();
+			SSBacktrace::backtrace();
 			user_error("Director::set_environment_type passed '$et'.  It should be passed dev, test, or live", E_USER_WARNING);
 		} else {
 			self::$environment_type = $et;
diff --git a/dev/CliDebugView.php b/dev/CliDebugView.php
index 9848be2e0..fb2857c65 100644
--- a/dev/CliDebugView.php
+++ b/dev/CliDebugView.php
@@ -50,7 +50,7 @@ class CliDebugView extends DebugView {
 	 * Write a backtrace
 	 */
 	function writeTrace() {
-		Debug::backtrace();
+		SSBacktrace::backtrace();
 	}
 
 	/**