diff --git a/src/enums/MDMarkingPosition.php b/src/enums/MDMarkingPosition.php
index 104615d..ad13aa6 100644
--- a/src/enums/MDMarkingPosition.php
+++ b/src/enums/MDMarkingPosition.php
@@ -4,7 +4,7 @@ declare(strict_types = 1);
 /**
  * Represents a marking position.
  */
-enum MDMarkingPosition implements MDValueEnumInterface, JsonSerializable, MDMeasurementUnitInterface {
+enum MDMarkingPosition implements MDValueEnumInterface, JsonSerializable {
 
     case front_front;
     case left;
diff --git a/src/enums/MDMarkingType.php b/src/enums/MDMarkingType.php
index d498ec7..2b92b3b 100644
--- a/src/enums/MDMarkingType.php
+++ b/src/enums/MDMarkingType.php
@@ -4,7 +4,7 @@ declare(strict_types = 1);
 /**
  * Represents a marking types.
  */
-enum MDMarkingType implements MDValueEnumInterface, JsonSerializable, MDMeasurementUnitInterface {
+enum MDMarkingType implements MDValueEnumInterface, JsonSerializable {
 
     case signature;
     case engraving;