diff --git a/src/wp-includes/js/wplink.js b/src/wp-includes/js/wplink.js
index f34a9bea09..b5a84aecb7 100644
--- a/src/wp-includes/js/wplink.js
+++ b/src/wp-includes/js/wplink.js
@@ -459,13 +459,14 @@ var wpLink;
 		},
 
 		keydown: function( event ) {
-			var fn, id,
-				key = $.ui.keyCode;
+			var fn, id;
 
-			if ( key.ESCAPE === event.keyCode ) {
+			// Escape key.
+			if ( 27 === event.keyCode ) {
 				wpLink.close();
 				event.stopImmediatePropagation();
-			} else if ( key.TAB === event.keyCode ) {
+			// Tab key.
+			} else if ( 9 === event.keyCode ) {
 				id = event.target.id;
 
 				// wp-link-submit must always be the last focusable element in the dialog.
@@ -479,7 +480,8 @@ var wpLink;
 				}
 			}
 
-			if ( event.keyCode !== key.UP && event.keyCode !== key.DOWN ) {
+			// Up Arrow and Down Arrow keys.
+			if ( 38 !== event.keyCode && 40 !== event.keyCode ) {
 				return;
 			}
 
@@ -488,7 +490,8 @@ var wpLink;
 				return;
 			}
 
-			fn = event.keyCode === key.UP ? 'prev' : 'next';
+			// Up Arrow key.
+			fn = 38 === event.keyCode ? 'prev' : 'next';
 			clearInterval( wpLink.keyInterval );
 			wpLink[ fn ]();
 			wpLink.keyInterval = setInterval( wpLink[ fn ], wpLink.keySensitivity );
@@ -496,9 +499,8 @@ var wpLink;
 		},
 
 		keyup: function( event ) {
-			var key = $.ui.keyCode;
-
-			if ( event.which === key.UP || event.which === key.DOWN ) {
+			// Up Arrow and Down Arrow keys.
+			if ( 38 === event.keyCode || 40 === event.keyCode ) {
 				clearInterval( wpLink.keyInterval );
 				event.preventDefault();
 			}