diff --git a/src/test/java/com/cronutils/parser/CronParserCron4JIntegrationTest.java b/src/test/java/com/cronutils/parser/CronParserCron4JIntegrationTest.java
index <HASH>..<HASH> 100644
--- a/src/test/java/com/cronutils/parser/CronParserCron4JIntegrationTest.java
+++ b/src/test/java/com/cronutils/parser/CronParserCron4JIntegrationTest.java
@@ -39,4 +39,10 @@ public class CronParserCron4JIntegrationTest {
         String cronExpr = "* 1 5-2 * 4";
         cron4jParser.parse(cronExpr);
     }
+
+    @Test
+    public void testParseSunday() throws Exception {
+        String cronExpr = "* * * * sun";
+        cron4jParser.parse(cronExpr);
+    }
 }
Add test for issue #<I>