diff --git a/src/Makefile.in b/src/Makefile.in
index 130f9ac30d..864bcb0249 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -80,6 +80,7 @@ LIB_CPP_SRC=\
  gtk/listbox.cpp \
  gtk/mdi.cpp \
  gtk/menu.cpp \
+ gtk/notebook.cpp \
  gtk/palette.cpp \
  gtk/pen.cpp \
  gtk/radiobox.cpp \