diff --git a/src/unit/engine/PhpunitTestEngine.php b/src/unit/engine/PhpunitTestEngine.php
index d76423f5..d20e0b41 100644
--- a/src/unit/engine/PhpunitTestEngine.php
+++ b/src/unit/engine/PhpunitTestEngine.php
@@ -126,7 +126,7 @@ final class PhpunitTestEngine extends ArcanistBaseUnitTestEngine {
       );
     }
 
-    $json = str_replace('}{"', '},{"', $json);
+    $json = preg_replace('/}{\s*"/', '},{"', $json);
     $json = '[' . $json . ']';
     $json = json_decode($json);
     if (!is_array($json)) {