diff --git a/libavformat/hdsenc.c b/libavformat/hdsenc.c
index 64d9f1413d..2a52019120 100644
--- a/libavformat/hdsenc.c
+++ b/libavformat/hdsenc.c
@@ -368,7 +368,7 @@ static int hds_write_header(AVFormatContext *s)
             ctx->flags = s->flags;
 
             ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf),
-                                         AVIO_FLAG_WRITE, os,
+                                         1, os,
                                          NULL, hds_write, NULL);
             if (!ctx->pb) {
                 return AVERROR(ENOMEM);
diff --git a/libavformat/segment.c b/libavformat/segment.c
index 9861462405..d531286c31 100644
--- a/libavformat/segment.c
+++ b/libavformat/segment.c
@@ -569,7 +569,7 @@ static int open_null_ctx(AVIOContext **ctx)
     uint8_t *buf = av_malloc(buf_size);
     if (!buf)
         return AVERROR(ENOMEM);
-    *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
+    *ctx = avio_alloc_context(buf, buf_size, 1, NULL, NULL, NULL, NULL);
     if (!*ctx) {
         av_free(buf);
         return AVERROR(ENOMEM);
diff --git a/libavformat/smoothstreamingenc.c b/libavformat/smoothstreamingenc.c
index 27b59c299c..6bede7c254 100644
--- a/libavformat/smoothstreamingenc.c
+++ b/libavformat/smoothstreamingenc.c
@@ -335,7 +335,7 @@ static int ism_write_header(AVFormatContext *s)
         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
         st->time_base = s->streams[i]->time_base;
 
-        ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
+        ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), 1, os, NULL, ism_write, ism_seek);
         if (!ctx->pb) {
             return AVERROR(ENOMEM);
         }
diff --git a/libavformat/tests/movenc.c b/libavformat/tests/movenc.c
index 04155dde76..2af72f11c7 100644
--- a/libavformat/tests/movenc.c
+++ b/libavformat/tests/movenc.c
@@ -186,7 +186,7 @@ static void init_fps(int bf, int audio_preroll, int fps)
     ctx->oformat = av_guess_format(format, NULL, NULL);
     if (!ctx->oformat)
         exit(1);
-    ctx->pb = avio_alloc_context(iobuf, iobuf_size, AVIO_FLAG_WRITE, NULL, NULL, io_write, NULL);
+    ctx->pb = avio_alloc_context(iobuf, iobuf_size, 1, NULL, NULL, io_write, NULL);
     if (!ctx->pb)
         exit(1);
     ctx->pb->write_data_type = io_write_data_type;