diff --git a/erlang/apps/ar/src/ar.erl b/erlang/apps/ar/src/ar.erl
index 563c867..5291f45 100644
--- a/erlang/apps/ar/src/ar.erl
+++ b/erlang/apps/ar/src/ar.erl
@@ -1127,11 +1127,7 @@ read_ar_name(FP) ->
         "/" -> {ok, String};  % archive symbol table
         "//" -> {ok, String}; % archive string table
         [$/ | Numeral] ->     % offset into archive string table
-          case strtol:parse(Numeral, 10) of
-            {ok, Value, []} -> {ok, Value};
-            {ok, _Value, _} -> {error, trailing_garbage};
-            {error, _Reason} = Error -> Error
-          end;
+          strtol(Numeral, 10);
         _ ->
           case string:split(String ++ "$", "/") of
             [FileName, "$"] -> {ok, FileName};
@@ -1149,18 +1145,20 @@ read_ar_uid(FP) ->
 
 read_number(FP, Base, FieldSize) ->
   case read_string(FP, FieldSize) of
-    {ok, String} ->
-      case strtol:parse(trim_trailing_spaces(String), Base) of
-        {ok, Value, []} -> {ok, Value};
-        {ok, _Value, _} -> {error, trailing_garbage};
-        {error, _Reason} = Error -> Error
-      end;
+    {ok, String} -> strtol(trim_trailing_spaces(String), Base);
     {error, _Reason} = Error -> Error
   end.
 
 trim_trailing_spaces(String) ->
   string:trim(String, trailing, [$\s]).
 
+strtol(String, Base) ->
+  case strtol:parse(String, Base) of
+    {ok, {Value, _Rest = []}} -> {ok, Value};
+    {ok, {_Value, _Rest}} -> {error, trailing_garbage};
+    {error, _Reason} = Error -> Error
+  end.
+
 %% read FieldSize characters
 read_string(FP, FieldSize) ->
   case pdp10_stdio:fread(1, FieldSize, FP) of
diff --git a/erlang/apps/lib/src/strtol.erl b/erlang/apps/lib/src/strtol.erl
index bd77dd5..4656833 100644
--- a/erlang/apps/lib/src/strtol.erl
+++ b/erlang/apps/lib/src/strtol.erl
@@ -1,7 +1,7 @@
 %%% -*- erlang-indent-level: 2 -*-
 %%%
 %%% strtol() clone for Erlang
-%%% Copyright (C) 2018  Mikael Pettersson
+%%% Copyright (C) 2018-2019  Mikael Pettersson
 %%%
 %%% This file is part of pdp10-tools.
 %%%
@@ -30,7 +30,7 @@
 
 -type base() :: 0 | 2..36.
 
--spec parse(string(), base()) -> {ok, integer(), string()} | {error, any()}.
+-spec parse(string(), base()) -> {ok, {integer(), string()}} | {error, any()}.
 parse(String, Base) ->
   scan_spaces(String, Base).
 
@@ -98,7 +98,7 @@ scan_digits(String, Value, Base, Minus) ->
 
 return(Rest, Value0, Minus) ->
   Value = if Minus -> -Value0; true -> Value0 end,
-  {ok, Value, Rest}.
+  {ok, {Value, Rest}}.
 
 no_digits() ->
   {error, no_digits}.
diff --git a/erlang/apps/od/src/od.erl b/erlang/apps/od/src/od.erl
index b92a51a..ef4b76d 100644
--- a/erlang/apps/od/src/od.erl
+++ b/erlang/apps/od/src/od.erl
@@ -1,7 +1,7 @@
 %%% -*- erlang-indent-level: 2 -*-
 %%%
 %%% 'od' clone for files with 9-bit bytes
-%%% Copyright (C) 2013-2018  Mikael Pettersson
+%%% Copyright (C) 2013-2019  Mikael Pettersson
 %%%
 %%% This file is part of pdp10-tools.
 %%%
@@ -139,7 +139,7 @@ parse_radix(String) ->
 
 parse_bytes(String) ->
   case strtol:parse(String, 0) of
-    {ok, Value, Rest} ->
+    {ok, {Value, Rest}} ->
       Value * parse_multiplier(Rest);
     {error, _Reason} ->
       escript_runtime:fatal("invalid number '~s'\n", [String])
@@ -178,7 +178,7 @@ parse_size(String, OutputType, Opts) ->
     [$L | Rest] -> parse_z(Rest, 4, OutputType, Opts);
     _ ->
       case strtol:parse(String, 10) of
-        {ok, Size, Rest} when Size =:= 1; Size =:= 2; Size =:= 4 ->
+        {ok, {Size, Rest}} when Size =:= 1; Size =:= 2; Size =:= 4 ->
           parse_z(Rest, Size, OutputType, Opts);
         _ -> escript_runtime:fatal("invalid type size '~s'\n", [String])
       end