diff --git a/mozilla/mailnews/compose/src/nsMsgCompUtils.cpp b/mozilla/mailnews/compose/src/nsMsgCompUtils.cpp
index 7e2cc024132..7f97b9eb4e6 100644
--- a/mozilla/mailnews/compose/src/nsMsgCompUtils.cpp
+++ b/mozilla/mailnews/compose/src/nsMsgCompUtils.cpp
@@ -821,7 +821,7 @@ mime_generate_attachment_headers (const char *type,
 {
   nsresult rv;
 
-  nsCString buf("");
+  nsCString buf;
 
   NS_ASSERTION (encoding, "null encoding");