diff --git a/mach/proto/fp/cuf8.c b/mach/proto/fp/cuf8.c
index d2b9dd05b..70ee14c1a 100644
--- a/mach/proto/fp/cuf8.c
+++ b/mach/proto/fp/cuf8.c
@@ -38,7 +38,7 @@ long	src;	/* largest possible integer to convert */
 	fprintf(stderr,"CUF8(ds(%d),ss(%d),src(%D))\n\n",8,ss,i_src);
 #endif
 	if (i_src == 0)	{
-		zrf8(&src);
+		zrf8(&ss);
 		return;
 	}
 			/* ESTABLISHED THAT src != 0	*/