--- a/mailnews/base/util/nsMsgProtocol.cpp
+++ b/mailnews/base/util/nsMsgProtocol.cpp
@@ -576,17 +576,17 @@ NS_IMETHODIMP nsMsgProtocol::GetContentT
   else
     aContentType = m_ContentType;
   return NS_OK;
 }
 
 NS_IMETHODIMP nsMsgProtocol::SetContentType(const nsACString &aContentType)
 {
   nsAutoCString charset;
-  nsresult rv = NS_ParseContentType(aContentType, m_ContentType, charset);
+  nsresult rv = NS_ParseResponseContentType(aContentType, m_ContentType, charset);
   if (NS_FAILED(rv) || m_ContentType.IsEmpty())
     m_ContentType.AssignLiteral(UNKNOWN_CONTENT_TYPE);
   return rv;
 }
 
 NS_IMETHODIMP nsMsgProtocol::GetContentCharset(nsACString &aContentCharset)
 {
   aContentCharset.Truncate();

--- a/mailnews/imap/src/nsImapProtocol.cpp
+++ b/mailnews/imap/src/nsImapProtocol.cpp
@@ -9481,17 +9481,17 @@ NS_IMETHODIMP nsImapMockChannel::GetCont
   else
     aContentType = m_ContentType;
   return NS_OK;
 }
 
 NS_IMETHODIMP nsImapMockChannel::SetContentType(const nsACString &aContentType)
 {
   nsAutoCString charset;
-  nsresult rv = NS_ParseContentType(aContentType, m_ContentType, charset);
+  nsresult rv = NS_ParseResponseContentType(aContentType, m_ContentType, charset);
   if (NS_FAILED(rv) || m_ContentType.IsEmpty())
     m_ContentType.AssignLiteral(UNKNOWN_CONTENT_TYPE);
   return rv;
 }
 
 NS_IMETHODIMP nsImapMockChannel::GetContentCharset(nsACString &aContentCharset)
 {
   aContentCharset.Truncate();

--- a/mailnews/news/src/nsNntpMockChannel.cpp
+++ b/mailnews/news/src/nsNntpMockChannel.cpp
@@ -197,17 +197,17 @@ NS_IMETHODIMP nsNntpMockChannel::GetCont
   FORWARD_CALL(GetContentType, aContentType)
   aContentType = m_contentType;
   return NS_OK;
 }
 
 NS_IMETHODIMP nsNntpMockChannel::SetContentType(const nsACString &aContentType)
 {
   FORWARD_CALL(SetContentType, aContentType)
-  return NS_ParseContentType(aContentType, m_contentType, m_contentCharset);
+  return NS_ParseResponseContentType(aContentType, m_contentType, m_contentCharset);
 }
 
 NS_IMETHODIMP nsNntpMockChannel::GetContentCharset(nsACString &aCharset)
 {
   FORWARD_CALL(GetContentCharset, aCharset)
   aCharset = m_contentCharset;
   return NS_OK;
 }