diff --git a/cognito-forms.php b/cognito-forms.php
index 056d639..6ade6df 100644
--- a/cognito-forms.php
+++ b/cognito-forms.php
@@ -59,12 +59,6 @@ if ( !class_exists( 'CognitoFormsPlugin' ) ) {
 				add_action( $action, array( $this, $action ) );
 		}
 
-		// Registers plug-in filters
-		private function add_filters( $filters ) {
-			foreach ( $filters as $filter )
-				add_filter( $filter, array( $this, $filter ) );
-		}
-
 		// Registers shortcodes
 		private function add_shortcodes( $shortcodes ) {
 			foreach ( $shortcodes as $tag => $func )
@@ -171,10 +165,8 @@ if ( !class_exists( 'CognitoFormsPlugin' ) ) {
 		// Initialize classic editor (TinyMCE)
 		public function tinymce_init() {
 			if ( get_user_option( 'rich_editing' ) == 'true' ) {
-				$this->add_filters( array(
-					'tinymce_buttons',
-					'tinymce_external_plugins'
-				) );
+				add_filter( 'mce_buttons', array( $this, 'tinymce_buttons' ) );
+				add_filter( 'mce_external_plugins', array( $this, 'tinymce_external_plugins' ) );
 			}
 		}