diff --git a/rebar.config b/rebar.config
index 2044fe5..48417a6 100644
--- a/rebar.config
+++ b/rebar.config
@@ -13,7 +13,7 @@
             warn_exported_vars,
             warn_missing_spec,
             warn_untyped_record, debug_info,
-            {platform_define, "R18", r_18}]}.
+            {platform_define, "^18", r_18}]}.
 {deps_dir, "deps"}.
 {deps, [
   {lager,  "2.*", {git, "git://github.com/basho/lager.git",   "2.0.3"}},
diff --git a/src/wpool_pool.erl b/src/wpool_pool.erl
index ece4c9a..3d3ec39 100644
--- a/src/wpool_pool.erl
+++ b/src/wpool_pool.erl
@@ -308,7 +308,7 @@ build_wpool(Name) ->
   end.
 
 -ifdef(r_18).
-  seed_random() -> random:seed(timestamp()).
+  seed_random() -> random:seed(erlang:timestamp()).
 -else.
   seed_random() -> random:seed(now()).
--endif.
\ No newline at end of file
+-endif.