diff --git a/VAX/vax_fpa.c b/VAX/vax_fpa.c
index 222e52f0..77215b97 100644
--- a/VAX/vax_fpa.c
+++ b/VAX/vax_fpa.c
@@ -906,7 +906,7 @@ return rpackg (&a, flo);                                /* return frac */
 
 /* Floating add */
 
-void vax_fadd (UFP *a, UFP *b)
+void vax_fadd (UFP *a, UFP *b, uint32 mhi, uint32 mlo)
 {
 int32 ediff;
 UFP t;