diff --git a/src/s/usg5-4.h b/src/s/usg5-4.h
index f319ecd2d22..34a19bd37b0 100644
--- a/src/s/usg5-4.h
+++ b/src/s/usg5-4.h
@@ -196,6 +196,6 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    So give it a try.  */
 #define HAVE_SOCKETS
 
-#define bcopy(src,dst,n)	memcpy(dst,src,n)
+#define bcopy(src,dst,n)	memmove(dst,src,n)
 #define bcmp(src,dst,n)		memcmp(src,dst,n)
 #define bzero(s,n)		memset(s,0,n)