diff --git a/tests/php/src/TestCase.php b/tests/php/src/TestCase.php
index 17e56576ff7..09f7926c129 100644
--- a/tests/php/src/TestCase.php
+++ b/tests/php/src/TestCase.php
@@ -81,17 +81,6 @@ public function assertIndexedArrayContains( $expected_subset, $actual_superset )
 	 * @return mixed Data.
 	 */
 	public function normalize_closure_function_name( $data ) {
-		if ( is_string( $data ) ) {
-			$data = preg_replace(
-				'/\{closure[^}]+}/',
-				'{closure}',
-				$data
-			);
-		} elseif ( is_array( $data ) ) {
-			foreach ( $data as $key => $value ) {
-				$data[ $key ] = $this->normalize_closure_function_name( $value );
-			}
-		}
 		return $data;
 	}
 }