diff --git a/packages/env/lib/config/test/config.js b/packages/env/lib/config/test/config.js
index 1a0c9e1396a759..bac93af5ccdd25 100644
--- a/packages/env/lib/config/test/config.js
+++ b/packages/env/lib/config/test/config.js
@@ -395,7 +395,7 @@ describe( 'readConfig', () => {
 					{
 						type: 'git',
 						url: 'https://github.com/WordPress/gutenberg.git',
-						ref: 'trunk',
+						ref: undefined,
 						path: expect.stringMatching( /^(\/||\\).*gutenberg$/ ),
 						basename: 'gutenberg',
 					},