diff --git a/models/src/test/java/info/frostfs/sdk/UuidExtensionTest.java b/models/src/test/java/info/frostfs/sdk/UuidExtensionTest.java
index d4da874..9353b73 100644
--- a/models/src/test/java/info/frostfs/sdk/UuidExtensionTest.java
+++ b/models/src/test/java/info/frostfs/sdk/UuidExtensionTest.java
@@ -20,7 +20,7 @@ public class UuidExtensionTest {
         var result = UuidExtension.asBytes(TEST_UUID);
 
         //Then
-        assertThat(result).hasSize(15).containsExactly(TEST_UUID_BYTES);
+        assertThat(result).hasSize(16).containsExactly(TEST_UUID_BYTES);
     }
 
     @Test