diff --git a/libs/wpp/Makefile.in b/libs/wpp/Makefile.in
index 58a374cc64..9d501e925d 100644
--- a/libs/wpp/Makefile.in
+++ b/libs/wpp/Makefile.in
@@ -21,7 +21,7 @@ $(MODULE): $(OBJS)
 	$(RANLIB) $@
 
 ppy.tab.c ppy.tab.h: ppy.y
-	$(BISON) -ppp -d -t $(SRCDIR)/ppy.y -o ppy.tab.c
+	$(BISON) -d $(SRCDIR)/ppy.y -o ppy.tab.c
 
 # hack to allow parallel make
 ppy.tab.h: ppy.tab.c
diff --git a/libs/wpp/ppy.y b/libs/wpp/ppy.y
index 801c7acbe9..3d7928a76b 100644
--- a/libs/wpp/ppy.y
+++ b/libs/wpp/ppy.y
@@ -123,6 +123,8 @@ static int	nmacro_args;
 
 %}
 
+%name-prefix="pp"
+
 %union{
 	int		sint;
 	unsigned int	uint;