diff --git a/src/matrix-http-api.c b/src/matrix-http-api.c
index 1dda5e7..f041a5d 100644
--- a/src/matrix-http-api.c
+++ b/src/matrix-http-api.c
@@ -2199,6 +2199,31 @@ i_create_filter(MatrixAPI *api,
     g_free(path);
 }
 
+static void
+i_download_filter(MatrixAPI *api,
+                  MatrixAPICallback callback,
+                  gpointer user_data,
+                  const gchar *user_id,
+                  const gchar *filter_id,
+                  GError **error)
+{
+    gchar *encoded_user_id, *encoded_filter_id, *path;
+
+    encoded_user_id = soup_uri_encode(user_id, NULL);
+    encoded_filter_id = soup_uri_encode(filter_id, NULL);
+    path = g_strdup_printf("user/%s/filter/%s",
+                           encoded_user_id, encoded_filter_id);
+    g_free(encoded_user_id);
+    g_free(encoded_filter_id);
+
+    _send(MATRIX_HTTP_API(api),
+          callback, user_data,
+          CALL_API,
+          "GET", path, NULL, NULL, NULL, NULL,
+          FALSE, error);
+    g_free(path);
+}
+
 static void
 matrix_http_api_matrix_api_init(MatrixAPIInterface *iface)
 {
@@ -2263,7 +2288,7 @@ matrix_http_api_matrix_api_init(MatrixAPIInterface *iface)
     iface->notify_room_typing = i_notify_room_typing;
     iface->sync = i_sync;
     iface->create_filter = i_create_filter;
-    iface->download_filter = NULL;
+    iface->download_filter = i_download_filter;
 
     /* Search */