diff --git a/test/unittest/dds/subscriber/DataReaderTests.cpp b/test/unittest/dds/subscriber/DataReaderTests.cpp
index 8b2b7615f4c..3e9520e1f43 100644
--- a/test/unittest/dds/subscriber/DataReaderTests.cpp
+++ b/test/unittest/dds/subscriber/DataReaderTests.cpp
@@ -3464,8 +3464,10 @@ TEST_F(DataReaderTests, InstancePolicyAllocationConsistencyKeyed)
 
     // Below an ampliation of the last comprobation, for which it is proved the case of < 0 (-1),
     // which also means infinite value.
-    qos2.resource_limits().max_samples = 0;
+    // Updated to check negative values (Redmine ticket #20722)
+    qos2.resource_limits().max_samples = -1;
     qos2.resource_limits().max_instances = -1;
+    qos2.resource_limits().max_samples_per_instance = -1;
 
     ASSERT_EQ(ReturnCode_t::RETCODE_OK, default_data_reader2->set_qos(qos2));