diff --git a/lib/typespec.ex b/lib/typespec.ex
index a011c0e875..f46a235b7f 100644
--- a/lib/typespec.ex
+++ b/lib/typespec.ex
@@ -66,7 +66,7 @@ defmodule Typespec do
     quote do: {:integer, 0, unquote(integer)}
   end
 
-  defp typespec({:"=", line,[var,expr]}, vars, caller) do
+  defp typespec({:"::", line,[var,expr]}, vars, caller) do
     quote do: {:ann_type, unquote(line), [unquote(typespec(var, [elem(var,1)|vars], caller)), unquote(typespec(expr, vars, caller))]}
   end
 
diff --git a/test/elixir/typespec_test.exs b/test/elixir/typespec_test.exs
index 2040bf6bf9..438610e25d 100644
--- a/test/elixir/typespec_test.exs
+++ b/test/elixir/typespec_test.exs
@@ -195,8 +195,8 @@ defmodule Typespec.Test.Type do
   test "deftype with annotations" do
     {spec1, spec2} = 
     test_module do
-      t1 = deftype mytype, as: named=integer
-      t2 = deftype mytype1, as: fun(a=integer), returns: integer
+      t1 = deftype mytype, as: named :: integer
+      t2 = deftype mytype1, as: fun(a :: integer), returns: integer
       {t1,t2}
     end
     assert {:type, {:mytype, {:ann_type, _, [{:var, _, :named}, {:type, _, :integer, []}]}, []}} = spec1