diff --git a/rebar.config.sample b/rebar.config.sample
index f963c30..ea3fdc4 100644
--- a/rebar.config.sample
+++ b/rebar.config.sample
@@ -31,7 +31,8 @@
 {erl_opts, [{i, "myinclude"}, {src_dirs, ["src1", "src2"]},
             {platform_define,
             "(linux|solaris|freebsd|darwin)", 'HAVE_SENDFILE'},
-            {platform_define, "(linux|freebsd)", 'BACKLOG', 128}]}.
+            {platform_define, "(linux|freebsd)", 'BACKLOG', 128},
+            {platform_define, "R13", 'old_inets'}]}.
 
 %% MIB Options?
 {mib_opts, []}.
diff --git a/src/rebar_erlc_compiler.erl b/src/rebar_erlc_compiler.erl
index 871b9a1..f533d48 100644
--- a/src/rebar_erlc_compiler.erl
+++ b/src/rebar_erlc_compiler.erl
@@ -42,16 +42,29 @@
 %%
 %% * erl_opts - Erlang list of options passed to compile:file/2
 %%              It is also possible to specify platform specific
-%%              options by specifying a triplet where the first string
-%%              is a regex that is checked against Erlang's system
-%%              architecture string. E.g. to define HAVE_SENDFILE only
-%%              on systems with sendfile() and define BACKLOG on
-%%              Linux/FreeBSD as 128 do:
+%%              options by specifying a pair or a triplet where the
+%%              first string is a regex that is checked against the
+%%              string
+%%
+%%                OtpRelease ++ "-" ++ SysArch ++ "-" ++ Words.
+%%
+%%              where
+%%
+%%                OtpRelease = erlang:system_info(otp_release).
+%%                SysArch = erlang:system_info(system_architecture).
+%%                Words = integer_to_list(8 * erlang:system_info(wordsize)).
+%%
+%%              E.g. to define HAVE_SENDFILE only on systems with
+%%              sendfile(), to define BACKLOG on Linux/FreeBSD as 128,
+%%              and to define 'old_inets' for R13 OTP release do:
+%%
 %%              {erl_opts, [{platform_define,
 %%                           "(linux|solaris|freebsd|darwin)",
 %%                           'HAVE_SENDFILE'},
 %%                          {platform_define, "(linux|freebsd)",
-%%                           'BACKLOG', 128}]}.
+%%                           'BACKLOG', 128},
+%%                          {platform_define, "R13",
+%%                           'old_inets'}]}.
 %%
 
 -spec compile(Config::#config{}, AppFile::string()) -> 'ok'.
diff --git a/src/rebar_utils.erl b/src/rebar_utils.erl
index 17fb95a..f49969a 100644
--- a/src/rebar_utils.erl
+++ b/src/rebar_utils.erl
@@ -60,7 +60,8 @@ is_arch(ArchRegex) ->
 
 get_arch() ->
     Words = integer_to_list(8 * erlang:system_info(wordsize)),
-    erlang:system_info(system_architecture) ++ "-" ++ Words.
+    erlang:system_info(otp_release) ++ "-"
+        ++ erlang:system_info(system_architecture) ++ "-" ++ Words.
 
 %%
 %% Options = [Option] -- defaults to [use_stdout, abort_on_error]