diff --git a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/DeletableShape.java b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/DeletableShape.java
index d5ae52c9f2..7674407da8 100644
--- a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/DeletableShape.java
+++ b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/DeletableShape.java
@@ -1,7 +1,5 @@
 package com.baeldung.markerinterface;
 
-public interface DeletableShape {
-    double getArea();
+public interface DeletableShape extends Shape {
 
-    double getCircumference();
-}
\ No newline at end of file
+}
diff --git a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Rectangle.java b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Rectangle.java
index f8ea987c6f..d64ffad0a2 100644
--- a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Rectangle.java
+++ b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Rectangle.java
@@ -1,6 +1,6 @@
 package com.baeldung.markerinterface;
 
-public class Rectangle implements Deletable {
+public class Rectangle implements DeletableShape {
 
     private double width;
     private double height;
diff --git a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Shape.java b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Shape.java
new file mode 100644
index 0000000000..2e53aefc03
--- /dev/null
+++ b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/Shape.java
@@ -0,0 +1,6 @@
+package com.baeldung.markerinterface;
+
+public interface Shape {
+    double getArea();
+    double getCircumference();
+}
\ No newline at end of file
diff --git a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/ShapeDao.java b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/ShapeDao.java
index 49a389bd46..bc988a793d 100644
--- a/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/ShapeDao.java
+++ b/core-java-lang-oop/src/main/java/com/baeldung/markerinterface/ShapeDao.java
@@ -3,7 +3,7 @@ package com.baeldung.markerinterface;
 public class ShapeDao {
 
     public boolean delete(Object object) {
-        if (!(object instanceof Deletable)) {
+        if (!(object instanceof DeletableShape)) {
             return false;
         }
         // Calling the code that deletes the entity from the database