diff --git a/rebar.config.script b/rebar.config.script
index cefdea2..ac8ea1f 100644
--- a/rebar.config.script
+++ b/rebar.config.script
@@ -1,10 +1,22 @@
+
+ExistingErlOpts = proplists:get_value(erl_opts, CONFIG, []),
+
+CONFIG1 = case code:which(persistent_term) of
+    preloaded ->
+        lists:keyreplace(erl_opts, 1, CONFIG, {erl_opts, [{d, 'HAVE_PERSISTENT_TERM'}|ExistingErlOpts]});
+    non_existing ->
+        CONFIG
+    end,
+
+
+
 case erlang:function_exported(rebar3, main, 1) of
     true -> % rebar3
-        CONFIG;
+        CONFIG1;
     false -> % rebar 2.x or older
         %% Rebuild deps, possibly including those that have been moved to
         %% profiles
         [{deps, [
 	   {goldrush, ".*", {git, "https://github.com/DeadZen/goldrush.git", {tag, "0.1.9"}}}
-        ]} | lists:keydelete(deps, 1, CONFIG)]
+        ]} | lists:keydelete(deps, 1, CONFIG1)]
 end.
diff --git a/src/lager_config.erl b/src/lager_config.erl
index 78f69cd..646ab8a 100644
--- a/src/lager_config.erl
+++ b/src/lager_config.erl
@@ -73,7 +73,35 @@ set(Key, Value) ->
 %% persistent term was added in OTP 21.2 but we can't
 %% check minor versions with macros so we're stuck waiting
 %% for OTP 22
--if(?OTP_RELEASE < 22).
+-ifdef(HAVE_PERSISTENT_TERM).
+init() ->
+    ok.
+
+insert(Key, Value) ->
+    persistent_term:put({?TBL, Key}, Value).
+
+insert_new(Key, Value) ->
+    try persistent_term:get({?TBL, Key}) of
+        _Value ->
+            false
+    catch error:badarg ->
+              insert(Key, Value),
+              true
+    end.
+
+lookup(Key, Default) ->
+    try persistent_term:get({?TBL, Key}) of
+        Value -> Value
+    catch
+        error:badarg ->
+            Default
+    end.
+
+cleanup() ->
+    [ persistent_term:erase(K) || {{?TBL, _} = K, _} <- persistent_term:get() ].
+
+-else.
+
 init() ->
     %% set up the ETS configuration table
     _ = try ets:new(?TBL, [named_table, public, set, {keypos, 1}, {read_concurrency, true}]) of
@@ -85,10 +113,10 @@ init() ->
         end.
 
 insert(Key, Value) ->
-    ets:insert(?TBL, {{Sink, Key}, Value}).
+    ets:insert(?TBL, {Key, Value}).
 
 insert_new(Key, Value) ->
-    ets:insert_new(?TBL, Key, Value).
+    ets:insert_new(?TBL, {Key, Value}).
 
 lookup(Key, Default) ->
     try
@@ -104,32 +132,5 @@ lookup(Key, Default) ->
     end.
 
 cleanup() -> ok.
-
--else.
-init() -> ok.
-
-insert(Key, Value) ->
-    persistent_term:put({?TBL, Key}, Value).
-
-insert_new(Key, Value) ->
-    try persistent_term:get({?TBL, Key}) of
-        _Value ->
-            false
-    catch error:badarg ->
-              insert(Key, Value),
-              true
-    end.
-
-lookup(Key, Default) ->
-    try persistent_term:get({?TBL, Key}) of
-        Value -> Value
-    catch
-        error:badarg ->
-            Default
-    end.
-
-cleanup() ->
-    [ persistent_term:erase(K) || {{?TBL, _} = K, _} <- persistent_term:get() ].
-
 -endif.