diff --git a/server/subsonic/opensubsonic.go b/server/subsonic/opensubsonic.go
index 689f53790..126f96131 100644
--- a/server/subsonic/opensubsonic.go
+++ b/server/subsonic/opensubsonic.go
@@ -10,6 +10,7 @@ func (api *Router) GetOpenSubsonicExtensions(_ *http.Request) (*responses.Subson
 	response := newResponse()
 	response.OpenSubsonicExtensions = &responses.OpenSubsonicExtensions{
 		{Name: "transcodeOffset", Versions: []int32{1}},
+		{Name: "formPost", Versions: []int32{1}},
 	}
 	return response, nil
 }