diff --git a/libavformat/network.h b/libavformat/network.h
index 796d44ae5f..53bb9c07c7 100644
--- a/libavformat/network.h
+++ b/libavformat/network.h
@@ -63,10 +63,7 @@ static inline void ff_network_close(void)
 #endif
 }
 
-#if !HAVE_INET_ATON
-/* in os_support.c */
-int inet_aton (const char * str, struct in_addr * add);
-#endif
+int ff_inet_aton (const char * str, struct in_addr * add);
 
 #if !HAVE_STRUCT_SOCKADDR_STORAGE
 struct sockaddr_storage {
diff --git a/libavformat/os_support.c b/libavformat/os_support.c
index 4bf2e268cf..d9b6c1ed69 100644
--- a/libavformat/os_support.c
+++ b/libavformat/os_support.c
@@ -45,7 +45,7 @@
 #include <stdlib.h>
 #include <strings.h>
 
-int inet_aton (const char * str, struct in_addr * add)
+int ff_inet_aton (const char * str, struct in_addr * add)
 {
     unsigned int add1 = 0, add2 = 0, add3 = 0, add4 = 0;
 
@@ -58,6 +58,11 @@ int inet_aton (const char * str, struct in_addr * add)
 
     return 1;
 }
+#else
+int ff_inet_aton (const char * str, struct in_addr * add)
+{
+    return inet_aton(str, add);
+}
 #endif /* !HAVE_INET_ATON */
 
 #if !HAVE_GETADDRINFO
@@ -85,7 +90,7 @@ int ff_getaddrinfo(const char *node, const char *service,
     sin->sin_family = AF_INET;
 
     if (node) {
-        if (!inet_aton(node, &sin->sin_addr)) {
+        if (!ff_inet_aton(node, &sin->sin_addr)) {
             if (hints && (hints->ai_flags & AI_NUMERICHOST)) {
                 av_free(sin);
                 return EAI_FAIL;
@@ -221,7 +226,7 @@ const char *ff_gai_strerror(int ecode)
 int resolve_host(struct in_addr *sin_addr, const char *hostname)
 {
 
-    if (!inet_aton(hostname, sin_addr)) {
+    if (!ff_inet_aton(hostname, sin_addr)) {
 #if HAVE_GETADDRINFO
         struct addrinfo *ai, *cur;
         struct addrinfo hints;
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index c7c6fc3422..60f13275e5 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -19,9 +19,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-/* needed by inet_aton() */
-#define _SVID_SOURCE
-
 #include "libavutil/base64.h"
 #include "libavutil/avstring.h"
 #include "libavutil/intreadwrite.h"
@@ -359,7 +356,7 @@ static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
         if (strcmp(buf1, "IP4") != 0)
             return;
         get_word_sep(buf1, sizeof(buf1), "/", &p);
-        if (inet_aton(buf1, &sdp_ip) == 0)
+        if (ff_inet_aton(buf1, &sdp_ip) == 0)
             return;
         ttl = 16;
         if (*p == '/') {
@@ -803,7 +800,7 @@ static void rtsp_parse_transport(RTSPMessageHeader *reply, const char *p)
                 if (*p == '=') {
                     p++;
                     get_word_sep(buf, sizeof(buf), ";,", &p);
-                    if (inet_aton(buf, &ipaddr))
+                    if (ff_inet_aton(buf, &ipaddr))
                         th->destination = ntohl(ipaddr.s_addr);
                 }
             }