diff --git a/include/vlc/libvlc_media_player.h b/include/vlc/libvlc_media_player.h
index 92a40de18a06..2403413eb6c1 100644
--- a/include/vlc/libvlc_media_player.h
+++ b/include/vlc/libvlc_media_player.h
@@ -2225,7 +2225,8 @@ typedef enum libvlc_audio_output_stereomode_t {
     libvlc_AudioStereoMode_RStereo = 2,
     libvlc_AudioStereoMode_Left    = 3,
     libvlc_AudioStereoMode_Right   = 4,
-    libvlc_AudioStereoMode_Dolbys  = 5
+    libvlc_AudioStereoMode_Dolbys  = 5,
+    libvlc_AudioStereoMode_Mono  = 7,
 } libvlc_audio_output_stereomode_t;
 
 
diff --git a/lib/audio.c b/lib/audio.c
index aa6e0d9c7fb9..eea0142e698b 100644
--- a/lib/audio.c
+++ b/lib/audio.c
@@ -371,7 +371,8 @@ int libvlc_audio_set_stereomode( libvlc_media_player_t *mp, libvlc_audio_output_
                   libvlc_AudioStereoMode_RStereo == AOUT_VAR_CHAN_RSTEREO &&
                   libvlc_AudioStereoMode_Left == AOUT_VAR_CHAN_LEFT &&
                   libvlc_AudioStereoMode_Right == AOUT_VAR_CHAN_RIGHT &&
-                  libvlc_AudioStereoMode_Dolbys == AOUT_VAR_CHAN_DOLBYS,
+                  libvlc_AudioStereoMode_Dolbys == AOUT_VAR_CHAN_DOLBYS &&
+                  libvlc_AudioStereoMode_Mono == AOUT_VAR_CHAN_MONO,
                   "Mismatch with stereo-mode LibVLC/VLC enums");
 
     audio_output_t *p_aout = GetAOut( mp );