diff --git a/test/unit/core.js b/test/unit/core.js
index c717711da..66a18268c 100644
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -813,7 +813,7 @@ QUnit.test( "end()", function( assert ) {
 
 	var x = jQuery( "#yahoo" );
 	x.parent();
-	assert.equal( "Yahoo", jQuery( "#yahoo" ).text(), "check for non-destructive behaviour" );
+	assert.equal( "Yahoo", jQuery( "#yahoo" ).text(), "check for non-destructive behavior" );
 } );
 
 QUnit.test( "length", function( assert ) {
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index 5959d32bd..4ad65ccb7 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -2279,7 +2279,7 @@ QUnit.test( "Cloned, detached HTML5 elems (#10667,10670)", function( assert ) {
 	// First clone
 	$clone = $section.clone();
 
-	// This branch tests a known behaviour in modern browsers that should never fail.
+	// This branch tests a known behavior in modern browsers that should never fail.
 	// Included for expected test count symmetry (expecting 1)
 	assert.equal( $clone[ 0 ].nodeName, "SECTION", "detached clone nodeName matches 'SECTION'" );