diff --git a/ulid/src/commonMain/kotlin/ulid/internal/ULIDValue.kt b/ulid/src/commonMain/kotlin/ulid/internal/ULIDValue.kt
index 00dcff8..56fa979 100644
--- a/ulid/src/commonMain/kotlin/ulid/internal/ULIDValue.kt
+++ b/ulid/src/commonMain/kotlin/ulid/internal/ULIDValue.kt
@@ -47,8 +47,4 @@ internal data class ULIDValue(
         buffer.write(leastSignificantBits, 8, 18)
         return buffer.concatToString()
     }
-
-    companion object {
-        private const val serialVersionUID = 1L
-    }
 }