diff --git a/test/command_callback/test_php_command_callback.vader b/test/command_callback/test_php_command_callback.vader
index 81e13f93..670d7196 100644
--- a/test/command_callback/test_php_command_callback.vader
+++ b/test/command_callback/test_php_command_callback.vader
@@ -4,6 +4,7 @@ Before:
   \   . ' -d log_errors=0 --'
 
 After:
+  unlet! b:command_tail
   call ale#assert#TearDownLinterTest()
 
 Execute(The executable should be configurable):