diff --git a/jacodb-ets/src/main/kotlin/org/jacodb/ets/model/EtsClass.kt b/jacodb-ets/src/main/kotlin/org/jacodb/ets/model/EtsClass.kt
index 3b18d7d27..d8661f88c 100644
--- a/jacodb-ets/src/main/kotlin/org/jacodb/ets/model/EtsClass.kt
+++ b/jacodb-ets/src/main/kotlin/org/jacodb/ets/model/EtsClass.kt
@@ -41,4 +41,17 @@ class EtsClassImpl(
     override fun toString(): String {
         return signature.toString()
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as EtsClassImpl
+
+        return signature == other.signature
+    }
+
+    override fun hashCode(): Int {
+        return signature.hashCode()
+    }
 }