diff --git a/tests/phpunit/includes/object-cache.php b/tests/phpunit/includes/object-cache.php
index 2bea171f19..ad7920f731 100644
--- a/tests/phpunit/includes/object-cache.php
+++ b/tests/phpunit/includes/object-cache.php
@@ -312,6 +312,16 @@ function wp_cache_flush( $delay = 0 ) {
 	return $wp_object_cache->flush( $delay );
 }
 
+/**
+ * Removes all cache items from the in-memory runtime cache.
+ *
+ * @return bool True on success, false on failure.
+ */
+function wp_cache_flush_runtime() {
+	global $wp_object_cache;
+	return $wp_object_cache->flush_runtime();
+}
+
 /**
  * Determines whether the object cache implementation supports a particular feature.
  *
@@ -332,16 +342,6 @@ function wp_cache_supports( $feature ) {
 	}
 }
 
-/**
- * Removes all cache items from the in-memory runtime cache.
- *
- * @return bool True on success, false on failure.
- */
-function wp_cache_flush_runtime() {
-	global $wp_object_cache;
-	return $wp_object_cache->flush_runtime();
-}
-
 /**
  * Retrieves object from cache.
  *