diff --git a/src/mero.erl b/src/mero.erl
index be23713..c09060b 100644
--- a/src/mero.erl
+++ b/src/mero.erl
@@ -147,7 +147,7 @@ mgets(ClusterName, Keys) ->
              ok | {error, Reason :: term()}.
 add(ClusterName, Key, Value, ExpTime, Timeout)
     when is_atom(ClusterName), is_binary(Value), is_integer(ExpTime) ->
-    BExpTime = list_to_binary(integer_to_list(ExpTime)),
+    BExpTime = integer_to_binary(ExpTime),
     mero_conn:add(ClusterName, Key, Value, BExpTime, Timeout).
 
 -spec madd(ClusterName :: atom(),
@@ -155,7 +155,7 @@ add(ClusterName, Key, Value, ExpTime, Timeout)
            Timeout :: integer()) ->
               [ok | {error, Reason :: term()}].
 madd(ClusterName, KVEs, Timeout) when is_atom(ClusterName) ->
-    L = [{Key, Value, list_to_binary(integer_to_list(ExpTime))}
+    L = [{Key, Value, integer_to_binary(ExpTime)}
          || {Key, Value, ExpTime} <- KVEs, is_binary(Key), is_binary(Value), is_integer(ExpTime)],
     mero_conn:madd(ClusterName, L, Timeout).
 
@@ -191,7 +191,7 @@ mset(ClusterName, KVEs, Timeout) ->
 
 cas(ClusterName, Key, Value, ExpTime, Timeout, CAS)
     when is_atom(ClusterName), is_binary(Value), is_integer(ExpTime) ->
-    BExpTime = list_to_binary(integer_to_list(ExpTime)),
+    BExpTime = integer_to_binary(ExpTime),
     %% note: if CAS is undefined, this will be an unconditional set:
     mero_conn:set(ClusterName, Key, Value, BExpTime, Timeout, CAS).
 
@@ -203,7 +203,7 @@ cas(ClusterName, Key, Value, ExpTime, Timeout, CAS)
 
 mcas(ClusterName, KVECs, Timeout) when is_atom(ClusterName) ->
     %% note: if CAS is undefined, the corresponding set will be unconditional.
-    L = [{Key, Value, list_to_binary(integer_to_list(ExpTime)), CAS}
+    L = [{Key, Value, integer_to_binary(ExpTime), CAS}
          || {Key, Value, ExpTime, CAS} <- KVECs,
             is_binary(Key),
             is_binary(Value),
@@ -234,9 +234,9 @@ increment_counter(ClusterName, Key) when is_atom(ClusterName) ->
 increment_counter(ClusterName, Key, Value, Initial, ExpTime, Retries, Timeout)
     when is_integer(Value), is_integer(ExpTime), is_atom(ClusterName), Initial >= 0,
          Value >= 0 ->
-    BValue = list_to_binary(integer_to_list(Value)),
-    BInitial = list_to_binary(integer_to_list(Initial)),
-    BExpTime = list_to_binary(integer_to_list(ExpTime)),
+    BValue = integer_to_binary(Value),
+    BInitial = integer_to_binary(Initial),
+    BExpTime = integer_to_binary(ExpTime),
     mero_conn:increment_counter(ClusterName,
                                 Key,
                                 BValue,
@@ -265,9 +265,9 @@ mincrement_counter(ClusterName, Keys) when is_atom(ClusterName), is_list(Keys) -
 mincrement_counter(ClusterName, Keys, Value, Initial, ExpTime, Timeout)
     when is_list(Keys), is_integer(Value), is_integer(ExpTime), is_atom(ClusterName),
          Initial >= 0, Value >= 0 ->
-    BValue = list_to_binary(integer_to_list(Value)),
-    BInitial = list_to_binary(integer_to_list(Initial)),
-    BExpTime = list_to_binary(integer_to_list(ExpTime)),
+    BValue = integer_to_binary(Value),
+    BInitial = integer_to_binary(Initial),
+    BExpTime = integer_to_binary(ExpTime),
     mero_conn:mincrement_counter(ClusterName, Keys, BValue, BInitial, BExpTime, Timeout).
 
 -spec delete(ClusterName :: atom(), Key :: mero_key(), Timeout :: integer()) ->
diff --git a/src/mero_util.erl b/src/mero_util.erl
index 3fa26d5..8f5e193 100644
--- a/src/mero_util.erl
+++ b/src/mero_util.erl
@@ -20,7 +20,7 @@ to_int(Value) when is_binary(Value) ->
 to_bin(Value) when is_binary(Value) ->
     Value;
 to_bin(Value) when is_integer(Value) ->
-    to_bin(integer_to_list(Value));
+    integer_to_binary(Value);
 to_bin(Value) when is_list(Value) ->
     list_to_binary(Value).
 
diff --git a/src/mero_wrk_tcp_txt.erl b/src/mero_wrk_tcp_txt.erl
index b0351a8..dee6a07 100755
--- a/src/mero_wrk_tcp_txt.erl
+++ b/src/mero_wrk_tcp_txt.erl
@@ -209,7 +209,7 @@ pack({?MEMCACHE_DELETE, {Key}}) when is_binary(Key) ->
 pack({?MEMCACHE_DELETEQ, {Key}}) when is_binary(Key) ->
     [<<"delete ">>, Key, <<" noreply ">>, <<"\r\n">>];
 pack({?MEMCACHE_ADD, {Key, Initial, ExpTime}}) ->
-    NBytes = integer_to_list(size(Initial)),
+    NBytes = integer_to_binary(size(Initial)),
     [<<"add ">>,
      Key,
      <<" ">>,
@@ -222,7 +222,7 @@ pack({?MEMCACHE_ADD, {Key, Initial, ExpTime}}) ->
      Initial,
      <<"\r\n">>];
 pack({?MEMCACHE_SET, {Key, Initial, ExpTime, undefined}}) ->
-    NBytes = integer_to_list(size(Initial)),
+    NBytes = integer_to_binary(size(Initial)),
     [<<"set ">>,
      Key,
      <<" ">>,
@@ -238,7 +238,7 @@ pack({?MEMCACHE_SET, {Key, Initial, ExpTime, CAS}}) when is_integer(CAS) ->
     %% note: CAS should only be supplied if setting a value after looking it up.  if the
     %% value has changed since we looked it up, the result of a cas command will be EXISTS
     %% (otherwise STORED).
-    NBytes = integer_to_list(size(Initial)),
+    NBytes = integer_to_binary(size(Initial)),
     [<<"cas ">>,
      Key,
      <<" ">>,