diff --git a/harbour/makefile.bc b/harbour/makefile.bc
index b203dfa457..cb4cff8479 100644
--- a/harbour/makefile.bc
+++ b/harbour/makefile.bc
@@ -718,6 +718,7 @@ GTWVT_LIB_OBJS = \
 #
 
 GTGUI_LIB_OBJS = \
+   $(OBJ_DIR)\gtdef.obj \
    $(OBJ_DIR)\gtgui.obj 
 
 #
@@ -2887,6 +2888,10 @@ $(OBJ_DIR)\gtwvt.obj : $(RTL_DIR)\gtwvt\gtwvt.c
 # GTGUI.LIB dependencies
 #
 
+$(OBJ_DIR)\gtdef.obj : $(RTL_DIR)\gtgui\gtdef.c
+   $(CC) $(CLIBFLAGS) -o$@ $**
+   tlib $(GTGUI_LIB) $(ARFLAGS) -+$@,,
+
 $(OBJ_DIR)\gtgui.obj : $(RTL_DIR)\gtgui\gtgui.c
    $(CC) $(CLIBFLAGS) -o$@ $**
    tlib $(GTGUI_LIB) $(ARFLAGS) -+$@,,