diff --git a/mozilla/mailnews/base/util/nsMsgDBFolder.cpp b/mozilla/mailnews/base/util/nsMsgDBFolder.cpp
index 41596077dc1..1733f774edf 100644
--- a/mozilla/mailnews/base/util/nsMsgDBFolder.cpp
+++ b/mozilla/mailnews/base/util/nsMsgDBFolder.cpp
@@ -5229,7 +5229,7 @@ NS_IMETHODIMP nsMsgDBFolder::GetMsgTextFromStream(nsIMsgDBHdr *msgHdr, nsIInputS
     {
       // Mail.app doesn't wrap the boundary id in quotes so we need 
       // to be sure to handle an unquoted boundary.
-      PRInt32 boundaryIndex = curLine.Find("boundary=");
+      PRInt32 boundaryIndex = curLine.Find("boundary=", PR_TRUE /* ignore case*/);
       if (boundaryIndex != kNotFound)
       {
         boundaryIndex += 9;