diff --git a/packages/style-engine/phpunit/class-wp-style-engine-processor-test.php b/packages/style-engine/phpunit/class-wp-style-engine-processor-test.php
index d5a7a45ad8dac9..1331d0c6c73148 100644
--- a/packages/style-engine/phpunit/class-wp-style-engine-processor-test.php
+++ b/packages/style-engine/phpunit/class-wp-style-engine-processor-test.php
@@ -213,7 +213,7 @@ public function test_combine_previously_added_css_rules() {
 		$a_lovely_processor->add_rules( $a_perfectly_lovely_rule );
 
 		$this->assertEquals(
-			'.a-lovely-rule,.a-lovelier-rule,.a-most-lovely-rule,.a-perfectly-lovely-rule{border-color: purple;}',
+			'.a-lovely-rule,.a-lovelier-rule,.a-most-lovely-rule,.a-perfectly-lovely-rule{border-color:purple;}',
 			$a_lovely_processor->get_css()
 		);
 	}