diff --git a/libavformat/avio.c b/libavformat/avio.c
index 8881f269f2..ac15407fda 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -39,8 +39,12 @@ static const char *urlcontext_to_name(void *ptr)
     else        return "NULL";
 }
 static const AVOption options[] = {{NULL}};
-static const AVClass urlcontext_class =
-        { "URLContext", urlcontext_to_name, options, LIBAVUTIL_VERSION_INT };
+static const AVClass urlcontext_class = {
+    .class_name     = "URLContext",
+    .item_name      = urlcontext_to_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
+};
 /*@}*/
 
 static int default_interrupt_cb(void);
diff --git a/libavformat/crypto.c b/libavformat/crypto.c
index fecc2c961c..789a4d1e76 100644
--- a/libavformat/crypto.c
+++ b/libavformat/crypto.c
@@ -52,7 +52,10 @@ static const AVOption options[] = {
 };
 
 static const AVClass crypto_class = {
-    "crypto", av_default_item_name, options, LIBAVUTIL_VERSION_INT
+    .class_name     = "crypto",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
 };
 
 static int crypto_open(URLContext *h, const char *uri, int flags)
diff --git a/libavformat/http.c b/libavformat/http.c
index ff8f2405eb..aa8c6657db 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -58,7 +58,10 @@ static const AVOption options[] = {
 {NULL}
 };
 static const AVClass httpcontext_class = {
-    "HTTP", av_default_item_name, options, LIBAVUTIL_VERSION_INT
+    .class_name     = "HTTP",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
 };
 
 static int http_connect(URLContext *h, const char *path, const char *hoststr,
diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index 2337837ef1..00ed6f8d4c 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -167,10 +167,10 @@ static const AVOption options[] = {
 };
 
 static const AVClass mp3_muxer_class = {
-    "MP3 muxer",
-    av_default_item_name,
-    options,
-    LIBAVUTIL_VERSION_INT,
+    .class_name     = "MP3 muxer",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
 };
 
 static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4],
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 8fa8a56c90..2aa9698651 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -89,10 +89,10 @@ static const AVOption options[] = {
 };
 
 static const AVClass mpegts_muxer_class = {
-    "MPEGTS muxer",
-    av_default_item_name,
-    options,
-    LIBAVUTIL_VERSION_INT,
+    .class_name     = "MPEGTS muxer",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
 };
 
 /* NOTE: 4 bytes must be left at the end for the crc32 */
diff --git a/libavformat/options.c b/libavformat/options.c
index bdf4796e49..483b644f8d 100644
--- a/libavformat/options.c
+++ b/libavformat/options.c
@@ -64,7 +64,12 @@ static const AVOption options[]={
 #undef D
 #undef DEFAULT
 
-static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options, LIBAVUTIL_VERSION_INT };
+static const AVClass av_format_context_class = {
+    .class_name     = "AVFormatContext",
+    .item_name      = format_to_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
+};
 
 static void avformat_get_context_defaults(AVFormatContext *s)
 {
diff --git a/libavformat/spdifenc.c b/libavformat/spdifenc.c
index 24c2f15754..735546096f 100644
--- a/libavformat/spdifenc.c
+++ b/libavformat/spdifenc.c
@@ -93,7 +93,12 @@ static const AVOption options[] = {
 { NULL },
 };
 
-static const AVClass class = { "spdif", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
+static const AVClass class = {
+    .class_name     = "spdif",
+    .item_name      = av_default_item_name,
+    .option         = options,
+    .version        = LIBAVUTIL_VERSION_INT,
+};
 
 static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
 {