diff --git a/harbour/contrib/hgf/win32/makefile.bc b/harbour/contrib/hgf/win32/makefile.bc
index 717f6d7fac..457bac1eee 100644
--- a/harbour/contrib/hgf/win32/makefile.bc
+++ b/harbour/contrib/hgf/win32/makefile.bc
@@ -31,7 +31,7 @@ $(OBJ_DIR)\winctrl.obj  : $(OBJ_DIR)\winctrl.c
 $(OBJ_DIR)\win32.obj    : win32.c
 
 .c.obj:
-  bcc32 $(CLIBFLAGS) -c -O2 -I$(INCLUDE_DIR) -o$@ $<
+  bcc32 $(CLIBFLAGS) -DHB_API_MACROS -c -O2 -I$(INCLUDE_DIR) -o$@ $<
   tlib $(LIB_DIR)\hgfwin32.lib -+$@,,
 
 .prg.c:
diff --git a/harbour/contrib/hgf/win32/makefile.vc b/harbour/contrib/hgf/win32/makefile.vc
index 75919d2a15..df2487dd61 100644
--- a/harbour/contrib/hgf/win32/makefile.vc
+++ b/harbour/contrib/hgf/win32/makefile.vc
@@ -5,7 +5,7 @@ INCLUDE_DIR = ..\..\..\include
 HARBOUR_EXE = ..\..\..\bin\vc\HARBOUR.EXE
 CC = CL
 CFLAGS = -TP -W3 -nologo -I$(INCLUDE_DIR) -DWIN32
-CLIBFLAGS = $(CFLAGS) -c
+CLIBFLAGS = $(CFLAGS) -c -DHB_API_MACROS
 CLIBFLAGSDEBUG = $(CLIBFLAGS) -Zi
 
 BIN_DIR = ..\..\..\bin\vc