diff --git a/layout/base/public/Makefile.in b/layout/base/public/Makefile.in
index 935a4c7ec7e2..c4dd92c217f8 100644
--- a/layout/base/public/Makefile.in
+++ b/layout/base/public/Makefile.in
@@ -93,6 +93,7 @@ nsIPrivateDOMImplementation.h \
 nsIContentSerializer.h \
 nsIHTMLToTextSink.h \
 nsIScrollableViewProvider.h \
+nsIPrintContext.h \
 $(NULL)
 
 XPIDLSRCS	= \