diff --git a/mozilla/mailnews/base/src/Makefile.in b/mozilla/mailnews/base/src/Makefile.in
index 26e9319d9c7..249ac7cc029 100644
--- a/mozilla/mailnews/base/src/Makefile.in
+++ b/mozilla/mailnews/base/src/Makefile.in
@@ -32,6 +32,7 @@ EXPORTS = \
 	nsNewsSet.h \
 	nsLocalFolderSummarySpec.h	\
 	nsUInt32Array.h \
+	nsMsgLineBuffer.h	\
 	$(NULL)
 
 CPPSRCS = \