diff --git a/src/mtp_config.erl b/src/mtp_config.erl
index 5d3e605..1708853 100644
--- a/src/mtp_config.erl
+++ b/src/mtp_config.erl
@@ -309,8 +309,9 @@ http_get(Url) ->
     UserAgent = ("MTProtoProxy/" ++ Vsn ++ " OTP-" ++ OtpVersion ++
                      " (+https://github.com/seriyps/mtproto_proxy)"),
     Headers = [{"User-Agent", UserAgent}],
+    Timeout = application:get_env(mtproto_proxy, core_api_http_timeout_ms, 3000),
     {ok, {{_, 200, _}, _, Body}} =
-        httpc:request(get, {Url, Headers}, [{timeout, 3000}], ?OPTS),
+        httpc:request(get, {Url, Headers}, [{timeout, Timeout}], ?OPTS),
     {ok, Body}.
 
 random_choice(L) ->
diff --git a/src/mtproto_proxy.app.src b/src/mtproto_proxy.app.src
index 35a2afc..cf0e515 100644
--- a/src/mtproto_proxy.app.src
+++ b/src/mtproto_proxy.app.src
@@ -154,6 +154,8 @@
         %% Mostly used to testing
         %% {proxy_secret_url, "https://core.telegram.org/getProxySecret"},
         %% {proxy_config_url, "https://core.telegram.org/getProxyConfig"},
+        %% HTTP timeout (ms) for fetching proxy config/secret
+        {core_api_http_timeout_ms, 3000}
 
         %% Upstream self-healthchecks tuning
         %% {upstream_healthchecks,