diff --git a/configure b/configure
index 0ecacceadb90614794c1847fbe84607514f5dc5b..29a3938caf523c0d7612102acd1d6870ee85f71e 100755
--- a/configure
+++ b/configure
@@ -668,7 +668,6 @@ HAVE_LIST="
     freetype2
     imlib2
     inet_aton
-    localtime_r
     lrintf
     machine_ioctl_bt848_h
     machine_ioctl_meteor_h
@@ -1531,7 +1530,6 @@ check_header byteswap.h
 check_header arpa/inet.h
 
 check_func inet_aton
-check_func localtime_r
 enabled zlib && check_lib zlib.h zlibVersion -lz || zlib="no"
 
 # ffserver uses poll(),
diff --git a/libavformat/os_support.c b/libavformat/os_support.c
index ded36d640063ec1eeb6db2e6e6b18bd57db84725..e627367593e85a151bd8e474d465e8c87aaa24aa 100644
--- a/libavformat/os_support.c
+++ b/libavformat/os_support.c
@@ -58,19 +58,6 @@ int64_t av_gettime(void)
 #endif
 }
 
-#if !defined(HAVE_LOCALTIME_R)
-struct tm *localtime_r(const time_t *t, struct tm *tp)
-{
-    struct tm *l;
-
-    l = localtime(t);
-    if (!l)
-        return 0;
-    *tp = *l;
-    return tp;
-}
-#endif /* !defined(HAVE_LOCALTIME_R) */
-
 #ifdef CONFIG_NETWORK
 #include "network.h"