diff --git a/PHP/CodeCoverage/Report/Node.php b/PHP/CodeCoverage/Report/Node.php
index 0f43a6e36..849148e3a 100644
--- a/PHP/CodeCoverage/Report/Node.php
+++ b/PHP/CodeCoverage/Report/Node.php
@@ -120,7 +120,7 @@ public function getId()
                 $parentId = $parent->getId();
 
                 if ($parentId == 'index') {
-                    $this->id = $this->name;
+                    $this->id = str_replace(':', '_', $this->name);
                 } else {
                     $this->id = $parentId . '_' . $this->name;
                 }