diff --git a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Period.enso b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Period.enso
index c20af53b2eed4..88c56e557072e 100644
--- a/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Period.enso
+++ b/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Period.enso
@@ -56,7 +56,7 @@ years y = new years=y
 ensure_period : Any -> Suspend (Any -> Any) -> Text -> Any ! (Time_Error | Illegal_Argument_Error)
 ensure_period object ~action error_msg="Cannot use Duration as a parameter" =
     case object of
-        period : Period -> action
+        _ : Period -> action
         _ : Duration.Duration ->
             Error.throw Time_Error_Data error_msg
         x ->
@@ -157,19 +157,19 @@ type Period
     compare_to : Period -> Ordering ! (Time_Error | Illegal_Argument_Error)
     compare_to self that =
         case self of
-            Period_With_Date _ start_date_self ->
+            Period.Period_With_Date _ start_date_self ->
                 case that of
-                    Period_With_Date _ start_date_that ->
+                    Period.Period_With_Date _ start_date_that ->
                         end_date_self = start_date_self + self
                         duration_self = Duration.between start_date_self.to_date_time end_date_self.to_date_time
                         end_date_that = start_date_that + that
                         duration_that = Duration.between start_date_that.to_date_time end_date_that.to_date_time
                         duration_self.compare_to duration_that
-                    Period_Without_Date _ ->
+                    Period.Period_Without_Date _ ->
                         (start_date_self + self).compare_to (start_date_self + that)
-            Period_Without_Date _ ->
+            Period.Period_Without_Date _ ->
                 case that of
-                    Period_With_Date _ start_date_that ->
+                    Period.Period_With_Date _ start_date_that ->
                         (start_date_that + self).compare_to (start_date_that + that)
-                    Period_Without_Date _ ->
+                    Period.Period_Without_Date _ ->
                         Error.throw (Time_Error_Data "Cannot compare two Period_Without_Date, as there is no start date")
diff --git a/test/Tests/src/Data/Time/Period_Spec.enso b/test/Tests/src/Data/Time/Period_Spec.enso
index 34d79005a0c6b..cb65ad5fac11f 100644
--- a/test/Tests/src/Data/Time/Period_Spec.enso
+++ b/test/Tests/src/Data/Time/Period_Spec.enso
@@ -34,7 +34,7 @@ spec =
             ((Period.between (Date.new 2022 1 10) (Date.new 2022 1 1)) < (Period.between (Date.new 2022 5 1) (Date.new 2022 5 10))) . should_be_true
             ((Period.between (Date.new 2022 1 10) (Date.new 2022 1 1)) != (Period.between (Date.new 2022 5 1) (Date.new 2022 5 10))) . should_be_true
             # 2020 is a leap year, so February in 2020 has more days than February in 2021
-            ((Period.between (Date.new 2020 1 2) (Date.new 2020 1 3)) > (Period.between (Date.new 2021 1 2) (Date.new 2021 1 3))) . should_be_true
+            ((Period.between (Date.new 2020 2 1) (Date.new 2020 3 1)) > (Period.between (Date.new 2021 2 1) (Date.new 2021 3 1))) . should_be_true
 
         Test.specify "should compare between Period_With_Date and Period_Without_Date" <|
             (Period.between (Date.new 2022 1 1) (Date.new 2022 1 2)) == (Period.days 1)