diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index 94ba9dcbc2..160c20e89e 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -90,7 +90,10 @@ class WP_Roles {
 	 * @return mixed|bool Return value of the callback, false otherwise.
 	 */
 	public function __call( $name, $arguments ) {
-		return call_user_func_array( array( $this, $name ), $arguments );
+		if ( '_init' === $name ) {
+			return call_user_func_array( array( $this, $name ), $arguments );
+		}
+		return false;
 	}
 
 	/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6e730c044a..0c2da5b9ee 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31146';
+$wp_version = '4.2-alpha-31147';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.