diff --git a/libavformat/ac3dec.c b/libavformat/ac3dec.c
index 51461befd8ee4..989d126a81bb0 100644
--- a/libavformat/ac3dec.c
+++ b/libavformat/ac3dec.c
@@ -131,7 +131,7 @@ const AVInputFormat ff_eac3_demuxer = {
     .read_header    = ff_raw_audio_read_header,
     .read_packet    = ff_raw_read_partial_packet,
     .flags          = AVFMT_GENERIC_INDEX,
-    .extensions     = "eac3",
+    .extensions     = "eac3,ec3",
     .raw_codec_id   = AV_CODEC_ID_EAC3,
     .priv_data_size = sizeof(FFRawDemuxerContext),
     .priv_class     = &ff_raw_demuxer_class,
diff --git a/libavformat/rawenc.c b/libavformat/rawenc.c
index 26099cb1c1add..267fce252d106 100644
--- a/libavformat/rawenc.c
+++ b/libavformat/rawenc.c
@@ -252,7 +252,7 @@ const AVOutputFormat ff_eac3_muxer = {
     .name              = "eac3",
     .long_name         = NULL_IF_CONFIG_SMALL("raw E-AC-3"),
     .mime_type         = "audio/x-eac3",
-    .extensions        = "eac3",
+    .extensions        = "eac3,ec3",
     .audio_codec       = AV_CODEC_ID_EAC3,
     .video_codec       = AV_CODEC_ID_NONE,
     .init              = force_one_stream,