diff --git a/src/PhpImap/IncomingMail.php b/src/PhpImap/IncomingMail.php
index a2a57cdb..02f2106c 100644
--- a/src/PhpImap/IncomingMail.php
+++ b/src/PhpImap/IncomingMail.php
@@ -46,7 +46,7 @@ public function replaceInternalLinks($baseUri) {
 			foreach($this->attachments as $attachment) {
 				if($attachment->contentId == $attachmentId) {
 					$search[] = $placeholder;
-					$replace[] = $baseUri . basename($this->attachments[$attachmentId]->filePath);
+					$replace[] = $baseUri . basename($this->attachments[$attachment->id]->filePath);
 				}
 			}
 		}