diff --git a/src/Driver/PHPDBG.php b/src/Driver/PHPDBG.php
index 1aca55819..42053af00 100644
--- a/src/Driver/PHPDBG.php
+++ b/src/Driver/PHPDBG.php
@@ -1,5 +1,5 @@
 <?php
-/*
+/**
  * This file is part of the php-code-coverage package.
  *
  * (c) Sebastian Bergmann <sebastian@phpunit.de>
@@ -99,6 +99,13 @@ private function detectExecutedLines(array $sourceLines, array $dbgData): array
             }
         }
 
+        foreach ($sourceLines as $file => $lines) {
+            $sourceLines[$file] = [
+                'lines' => $lines,
+                'functions' => []
+            ];
+        }
+
         return $sourceLines;
     }
 }