diff --git a/dmd2/mtype.c b/dmd2/mtype.c
index 561bef95..d305482c 100644
--- a/dmd2/mtype.c
+++ b/dmd2/mtype.c
@@ -8995,10 +8995,10 @@ MATCH TypeNull::implicitConvTo(Type *to)
     return MATCHnomatch;
 }
 
-void TypeNull::toDecoBuffer(OutBuffer *buf, int flag)
+void TypeNull::toDecoBuffer(OutBuffer *buf, int flag, bool mangle)
 {
     //tvoidptr->toDecoBuffer(buf, flag);
-    Type::toDecoBuffer(buf, flag);
+    Type::toDecoBuffer(buf, flag, mangle);
 }
 
 void TypeNull::toCBuffer(OutBuffer *buf, Identifier *ident, HdrGenState *hgs)
diff --git a/dmd2/mtype.h b/dmd2/mtype.h
index 587c9965..00536496 100644
--- a/dmd2/mtype.h
+++ b/dmd2/mtype.h
@@ -1010,7 +1010,7 @@ struct TypeNull : Type
     TypeNull();
 
     Type *syntaxCopy();
-    void toDecoBuffer(OutBuffer *buf, int flag);
+    void toDecoBuffer(OutBuffer *buf, int flag, bool mangle);
     MATCH implicitConvTo(Type *to);
 
     void toCBuffer(OutBuffer *buf, Identifier *ident, HdrGenState *hgs);