diff --git a/mailnews/imap/src/nsImapProtocol.cpp b/mailnews/imap/src/nsImapProtocol.cpp
index 0e7e6d3be9d..0a3317a84ca 100644
--- a/mailnews/imap/src/nsImapProtocol.cpp
+++ b/mailnews/imap/src/nsImapProtocol.cpp
@@ -220,7 +220,7 @@ nsImapProtocol::nsImapProtocol() :
 	m_allocatedSize = OUTPUT_BUFFER_SIZE;
 
 	// used to buffer incoming data by ReadNextLineFromInput
-	m_inputStreamBuffer = new nsMsgLineStreamBuffer(OUTPUT_BUFFER_SIZE, PR_FALSE /* leave CRLFs on the returned string */);
+	m_inputStreamBuffer = new nsMsgLineStreamBuffer(OUTPUT_BUFFER_SIZE, PR_TRUE /* allocate new lines */, PR_FALSE /* leave CRLFs on the returned string */);
 	m_currentBiffState = nsMsgBiffState_Unknown;
 
 	// where should we do this? Perhaps in the factory object?