diff --git a/src/unit/parser/ArcanistPhpunitTestResultParser.php b/src/unit/parser/ArcanistPhpunitTestResultParser.php
index 10a09051..608f1f57 100644
--- a/src/unit/parser/ArcanistPhpunitTestResultParser.php
+++ b/src/unit/parser/ArcanistPhpunitTestResultParser.php
@@ -8,6 +8,8 @@
  */
 final class ArcanistPhpunitTestResultParser extends ArcanistTestResultParser {
 
+  private $affectedTests;
+
   /**
    * Parse test results from phpunit json report
    *