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--- a/src/internfile/mh_mail.cpp
+++ b/src/internfile/mh_mail.cpp
@@ -100,7 +100,7 @@
     // the md5 computation to the mime analysis, but ...
     string md5, xmd5, reason;
     if (MD5File(fn, md5, &reason)) {
-	m_metaData["md5"] = MD5HexPrint(md5, xmd5);
+	m_metaData[cstr_md5] = MD5HexPrint(md5, xmd5);
     } else {
 	LOGERR(("MimeHandlerMail: cant compute md5 for [%s]: %s\n", fn.c_str(),
 		reason.c_str()));
@@ -132,7 +132,7 @@
 
     string md5, xmd5;
     MD5String(msgtxt, md5);
-    m_metaData["md5"] = MD5HexPrint(md5, xmd5);
+    m_metaData[cstr_md5] = MD5HexPrint(md5, xmd5);
 
     m_stream = new stringstream(msgtxt);
     delete m_bincdoc;