diff --git a/widget/src/gtk2/Makefile.in b/widget/src/gtk2/Makefile.in
index af1be4794f52..cd6928bdf801 100644
--- a/widget/src/gtk2/Makefile.in
+++ b/widget/src/gtk2/Makefile.in
@@ -99,6 +99,8 @@ CPPSRCS		= \
 		nsFilePicker.cpp \
 		nsSound.cpp \
 		nsNativeKeyBindings.cpp \
+		nsScreenGtk.cpp \
+		nsScreenManagerGtk.cpp \
 		$(NULL)
 
 # build our subdirs, too