Index: b/usr/src/lib/libc/common/sys/_so_accept.s
===================================================================
--- a/usr/src/lib/libc/common/sys/_so_accept.s
+++ b/usr/src/lib/libc/common/sys/_so_accept.s
@@ -33,8 +33,8 @@
 
 /* C library -- __so_accept						*/
 /*
- * int __so_accept(int sock, struct sockaddr *addr, int *addrlen, int vers,
- *     int flags)
+ * int __so_accept(int sock, struct sockaddr *addr, int *addrlen, int vers)
+ * int __so_accept4(int sock, struct sockaddr *addr, int *addrlen, int vers, int flags)
  */
 
 #include "SYS.h"
@@ -42,3 +42,7 @@
 	SYSCALL2_RVAL1(__so_accept,accept)
 	RET
 	SET_SIZE(__so_accept)
+
+	SYSCALL2_RVAL1(__so_accept4,accept4)
+	RET
+	SET_SIZE(__so_accept4)
Index: b/usr/src/lib/libc/port/threads/scalls.c
===================================================================
--- a/usr/src/lib/libc/port/threads/scalls.c
+++ b/usr/src/lib/libc/port/threads/scalls.c
@@ -1067,13 +1067,22 @@ sigqueue(pid_t pid, int signo, const uni
 }
 
 int
-_so_accept(int sock, struct sockaddr *addr, uint_t *addrlen, int version,
+_so_accept(int sock, struct sockaddr *addr, uint_t *addrlen, int version)
+{
+	extern int __so_accept(int, struct sockaddr *, uint_t *, int);
+	int rv;
+
+	PERFORM(__so_accept(sock, addr, addrlen, version))
+}
+
+int
+_so_accept4(int sock, struct sockaddr *addr, uint_t *addrlen, int version,
     int flags)
 {
-	extern int __so_accept(int, struct sockaddr *, uint_t *, int, int);
+	extern int __so_accept4(int, struct sockaddr *, uint_t *, int, int);
 	int rv;
 
-	PERFORM(__so_accept(sock, addr, addrlen, version, flags))
+	PERFORM(__so_accept4(sock, addr, addrlen, version, flags))
 }
 
 int
Index: b/usr/src/lib/libsocket/socket/weaks.c
===================================================================
--- a/usr/src/lib/libsocket/socket/weaks.c
+++ b/usr/src/lib/libsocket/socket/weaks.c
@@ -61,6 +61,7 @@
 extern int _so_bind();
 extern int _so_listen();
 extern int _so_accept();
+extern int _so_accept4();
 extern int _so_connect();
 extern int _so_shutdown();
 extern int _so_recv();
@@ -93,13 +94,13 @@ _listen(int sock, int backlog)
 int
 _accept(int sock, struct sockaddr *addr, int *addrlen)
 {
-	return (_so_accept(sock, addr, addrlen, SOV_DEFAULT, 0));
+	return (_so_accept(sock, addr, addrlen, SOV_DEFAULT));
 }
 
 int
 _accept4(int sock, struct sockaddr *addr, int *addrlen, int flags)
 {
-	return (_so_accept(sock, addr, addrlen, SOV_DEFAULT, flags));
+	return (_so_accept4(sock, addr, addrlen, SOV_DEFAULT, flags));
 }
 
 int
Index: b/usr/src/lib/libc/port/mapfile-vers
===================================================================
--- a/usr/src/lib/libc/port/mapfile-vers
+++ b/usr/src/lib/libc/port/mapfile-vers
@@ -262,6 +262,7 @@ SYMBOL_VERSION ILLUMOS_0.4 {	# Illumos a
 
 SYMBOL_VERSION DYSON_1 {
     global:
+        _so_accept4;
         cfmakeraw;
         error;
         error_at_line;