diff --git a/build.gradle b/build.gradle
index 5cd2de53441..2ab2e09afbc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -73,4 +73,4 @@ defaultTasks 'clean', 'test'
 
 run {
     enableAssertions = true
-}
+}
\ No newline at end of file
diff --git a/src/main/java/seedu/address/ui/AppointmentCard.java b/src/main/java/seedu/address/ui/AppointmentCard.java
index fd462f7e85f..bf6251f8e90 100644
--- a/src/main/java/seedu/address/ui/AppointmentCard.java
+++ b/src/main/java/seedu/address/ui/AppointmentCard.java
@@ -14,7 +14,7 @@
 public class AppointmentCard extends UiPart<Region> {
 
     private static final String FXML = "AppointmentListCard.fxml";
-    public static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
+    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
 
     /**
      * Note: Certain keywords such as "location" and "resources" are reserved keywords in JavaFX.