diff --git a/test/cli/fixtures/unhandled-rejection.js b/test/cli/fixtures/unhandled-rejection.js
index 82d3b6eed..4846a8925 100644
--- a/test/cli/fixtures/unhandled-rejection.js
+++ b/test/cli/fixtures/unhandled-rejection.js
@@ -6,19 +6,16 @@ QUnit.module( "Unhandled Rejections", function() {
 
 		const done = assert.async();
 
-		new Promise( function( resolve ) {
-			setTimeout( resolve );
-		} )
-			.then( function() {
+		Promise.resolve().then( function() {
 
-				// throwing a non-Error here because stack trace representation
-				// across Node versions is not stable (they continue to get better)
-				throw {
-					message: "Error thrown in non-returned promise!",
-					stack: `Error: Error thrown in non-returned promise!
+			// throwing a non-Error here because stack trace representation
+			// across Node versions is not stable (they continue to get better)
+			throw {
+				message: "Error thrown in non-returned promise!",
+				stack: `Error: Error thrown in non-returned promise!
     at /some/path/wherever/unhandled-rejection.js:13:11`
-				};
-			} );
+			};
+		} );
 
 		// prevent test from exiting before unhandled rejection fires
 		setTimeout( done, 10 );
diff --git a/test/reporter-html/unhandled-rejection.js b/test/reporter-html/unhandled-rejection.js
index 55c3c66e4..5205e2e8e 100644
--- a/test/reporter-html/unhandled-rejection.js
+++ b/test/reporter-html/unhandled-rejection.js
@@ -17,12 +17,9 @@ if ( HAS_UNHANDLED_REJECTION_HANDLER ) {
 		QUnit.test( "test passes just fine, but has a rejected promise", function( assert ) {
 			const done = assert.async();
 
-			new Promise( function( resolve ) {
-				setTimeout( resolve );
-			} )
-				.then( function() {
-					throw new Error( "Error thrown in non-returned promise!" );
-				} );
+			Promise.resolve().then( function() {
+				throw new Error( "Error thrown in non-returned promise!" );
+			} );
 
 			// prevent test from exiting before unhandled rejection fires
 			setTimeout( done, 10 );