diff --git a/src/s/isc3-0.h b/src/s/isc3-0.h
index f46994e56ff..7e71bed66fa 100644
--- a/src/s/isc3-0.h
+++ b/src/s/isc3-0.h
@@ -26,4 +26,6 @@
 /* marko@tekelec.com (Marko Rauhamaa) says that his linker couldn't
    find memmove, but that sounds crazy - I thought all SYSV
    descendants had that.  Let us know if this turns out to be wrong.  */
-#define	memmove(d, s, n) safe_bcopy ((s), (d), (n))
+/* It is safe to have no parens around the args in the safe_bcopy call,
+   and parens would screw up the prototype decl for memmove.  */
+#define	memmove(d, s, n) safe_bcopy (s, d, n)