diff --git a/lib/crontab/cron_expression/parser.ex b/lib/crontab/cron_expression/parser.ex
index ddfeb95..8a13dc2 100644
--- a/lib/crontab/cron_expression/parser.ex
+++ b/lib/crontab/cron_expression/parser.ex
@@ -349,7 +349,7 @@ defmodule Crontab.CronExpression.Parser do
       {number, ""} ->
         {:ok, number}
 
-      :error ->
+      _ ->
         {:error, "Can't parse " <> value <> " as interval " <> Atom.to_string(interval) <> "."}
     end
   end
diff --git a/test/crontab/cron_expression/parser_test.exs b/test/crontab/cron_expression/parser_test.exs
index e71d3ad..ebadd86 100644
--- a/test/crontab/cron_expression/parser_test.exs
+++ b/test/crontab/cron_expression/parser_test.exs
@@ -374,6 +374,10 @@ defmodule Crontab.CronExpression.ParserTest do
     assert parse("*/0") == {:error, "Can't parse 0 as increment."}
   end
 
+  test "parse invalid year expression gives error" do
+    assert parse("* * * * * 1x") == {:error, "Can't parse 1x as interval year."}
+  end
+
   describe "parse/2 non-range step value" do
     setup do: %{now: ~N[2024-01-01 00:00:01]}