diff --git a/mimetreeparser/src/viewer/messagepart.cpp b/mimetreeparser/src/viewer/messagepart.cpp
--- a/mimetreeparser/src/viewer/messagepart.cpp
+++ b/mimetreeparser/src/viewer/messagepart.cpp
@@ -1011,6 +1011,7 @@
             if (!textNode->head().isEmpty()) {
                 textNode->contentDescription()->from7BitString("opaque signed data");
             }
+            mNode->addContent(textNode); // attach signature to parent
             mOtp->mNodeHelper->attachExtraContent(mNode, textNode);
         }