diff --git a/src/eFmt.erl b/src/eFmt.erl
index f359fa4..d7fa55a 100644
--- a/src/eFmt.erl
+++ b/src/eFmt.erl
@@ -1,6 +1,8 @@
 -module(eFmt).
 
 -import(binary, [split/2, part/3]).
+-import(lists, [keyfind/3, reverse/2]).
+-import(maps, [iterator/1, next/1]).
 
 -compile(inline).
 -compile({inline_size, 128}).
@@ -237,7 +239,7 @@ writeMap(Map, D, E, BinAcc) ->
       D =:= 1 ->
          <<BinAcc/binary, "...}">>;
       true ->
-         writeMapBody(maps:iterator(Map), D, E, BinAcc)
+         writeMapBody(iterator(Map), D, E, BinAcc)
    end.
 
 writeMapBody(I, D, E, BinAcc) ->
@@ -245,7 +247,7 @@ writeMapBody(I, D, E, BinAcc) ->
       D =:= 1 ->
          <<BinAcc/binary, " ...}">>;
       true ->
-         case maps:next(I) of
+         case next(I) of
             {K, V, none} ->
                KeyTermBin = writeTerm(K, -1, E),
                ValueTermBin = writeTerm(V, -1, E),
@@ -369,7 +371,7 @@ writeMap(Map, Depth, Width, Encoding, Strings, SumLC, BinAcc) ->
       Depth =:= 1 ->
          <<BinAcc/binary, "...}">>;
       true ->
-         writeMapBody(maps:iterator(Map), Depth, Width, Encoding, Strings, SumLC, BinAcc)
+         writeMapBody(iterator(Map), Depth, Width, Encoding, Strings, SumLC, BinAcc)
    end.
 
 writeMapBody(I, Depth, Width, Encoding, Strings, SumLC, BinAcc) ->
@@ -377,7 +379,7 @@ writeMapBody(I, Depth, Width, Encoding, Strings, SumLC, BinAcc) ->
       Depth =:= 1 ->
          <<BinAcc/binary, " ...}">>;
       true ->
-         case maps:next(I) of
+         case next(I) of
             {K, V, none} ->
                KeyTermBin = writeTerm(K, -1, Width, Encoding, Strings),
                ValueTermBin = writeTerm(V, -1, Width, Encoding, Strings),
@@ -643,7 +645,7 @@ buildSmall([], CharsLimit, P, S, W, Other, Acc) ->
             [One, Two, Three] ->
                [Three, Two, One];
             Ret ->
-               lists:reverse(Ret, [])
+               reverse(Ret, [])
          end
    end;
 buildSmall([OneCA | Cs], CharsLimit, P, S, W, Other, Acc) ->
@@ -1012,7 +1014,7 @@ charsLen(S) ->
    end.
 
 getOpt(Key, TupleList, Default) ->
-   case lists:keyfind(Key, 1, TupleList) of
+   case keyfind(Key, 1, TupleList) of
       false ->
          Default;
       ValueTuple ->