diff --git a/lib/crontab/cron_expression/ecto_type.ex b/lib/crontab/cron_expression/ecto_type.ex
index dba6646..5c8481c 100644
--- a/lib/crontab/cron_expression/ecto_type.ex
+++ b/lib/crontab/cron_expression/ecto_type.ex
@@ -54,7 +54,10 @@ end
     def cast(cron_expression = %Crontab.CronExpression{}), do: {:ok, cron_expression}
 
     def cast(cron_expression) when is_binary(cron_expression) do
-      case Parser.parse(cron_expression) do
+      cron_expression
+      |> String.trim()
+      |> Parser.parse()
+      |> case do
         result = {:ok, _} -> result
         _ -> :error
       end
diff --git a/test/crontab/cron_expression/ecto_type_test.exs b/test/crontab/cron_expression/ecto_type_test.exs
index 8eda42d..5573eea 100644
--- a/test/crontab/cron_expression/ecto_type_test.exs
+++ b/test/crontab/cron_expression/ecto_type_test.exs
@@ -26,6 +26,12 @@ end
       assert Type.cast("*") == {:ok, ~e[*]}
     end
 
+    test "cast/1 String with whitespace" do
+      assert Type.cast("* ") == {:ok, ~e[*]}
+      assert Type.cast(" * ") == {:ok, ~e[*]}
+      assert Type.cast(" *") == {:ok, ~e[*]}
+    end
+
     test "cast/1 CronExpression" do
       assert Type.cast(~e[*]) == {:ok, ~e[*]}
     end