diff --git a/src/luerl.erl b/src/luerl.erl
index a90dfc1..ee04c49 100644
--- a/src/luerl.erl
+++ b/src/luerl.erl
@@ -46,6 +46,9 @@
 %% Helping with storing VM state
 -export([externalize/1,internalize/1]).
 
+%% Storing and retrieving private data
+-export([put_private/3,get_private/2]).
+
 %% init() -> State.
 
 init() ->
@@ -506,3 +509,10 @@ externalize(S) ->
 
 internalize(S) ->
     luerl_lib_math:internalize(S).
+
+put_private(Key, Value, S) ->
+    Private = maps:put(Key, Value, S#luerl.private),
+    S#luerl{private=Private}.
+
+get_private(Key, S) ->
+    maps:get(Key, S#luerl.private).
diff --git a/src/luerl.hrl b/src/luerl.hrl
index 21ce276..824dcac 100644
--- a/src/luerl.hrl
+++ b/src/luerl.hrl
@@ -34,7 +34,8 @@
                 rand,                           %Random state
                 tag,                            %Unique tag
                 trace_func=none,                %Trace function
-                trace_data                      %Trace data
+                trace_data,                     %Trace data
+                private=#{}
                }).
 
 %% Table structure.