diff --git a/cronexpression_test.go b/cronexpression_test.go
index 451b09b..e3da33e 100644
--- a/cronexpression_test.go
+++ b/cronexpression_test.go
@@ -98,11 +98,11 @@ var crontests = []crontest{
     // Days of week
     {
         "0 0 * * MON",
-        "MON 2006-01-02 15:04",
+        "Mon 2006-01-02 15:04",
         []crontimes{
-            {"2013-01-01 00:00:00", "MON 2013-01-07 00:00"},
-            {"2013-01-28 00:00:00", "MON 2013-02-04 00:00"},
-            {"2013-12-30 00:30:00", "MON 2014-01-06 00:00"},
+            {"2013-01-01 00:00:00", "Mon 2013-01-07 00:00"},
+            {"2013-01-28 00:00:00", "Mon 2013-02-04 00:00"},
+            {"2013-12-30 00:30:00", "Mon 2014-01-06 00:00"},
         },
     },