diff --git a/common/dynamic_partition_control_interface.h b/common/dynamic_partition_control_interface.h
index e6ebe6a..2c01b1a 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -73,6 +73,8 @@
   // DOES NOT tell you if VABC is used for current OTA update. For that, use
   // UpdateUsesSnapshotCompression.
   virtual FeatureFlag GetVirtualAbCompressionFeatureFlag() = 0;
+  // Return the feature flag for Virtual AB Compression XOR
+  virtual FeatureFlag GetVirtualAbCompressionXorFeatureFlag() = 0;
 
   // Attempt to optimize |operation|.
   // If successful, |optimized| contains an operation with extents that
diff --git a/common/dynamic_partition_control_stub.cc b/common/dynamic_partition_control_stub.cc
index dd30a8b..6283b1d 100644
--- a/common/dynamic_partition_control_stub.cc
+++ b/common/dynamic_partition_control_stub.cc
@@ -38,6 +38,10 @@
   return FeatureFlag(FeatureFlag::Value::NONE);
 }
 
+FeatureFlag DynamicPartitionControlStub::GetVirtualAbCompressionXorFeatureFlag() {
+  return FeatureFlag(FeatureFlag::Value::NONE);
+}
+
 bool DynamicPartitionControlStub::OptimizeOperation(
     const std::string& partition_name,
     const InstallOperation& operation,
diff --git a/common/dynamic_partition_control_stub.h b/common/dynamic_partition_control_stub.h
index 5aa4336..15137d2 100644
--- a/common/dynamic_partition_control_stub.h
+++ b/common/dynamic_partition_control_stub.h
@@ -27,11 +27,12 @@
 
 namespace chromeos_update_engine {
 
-class DynamicPartitionControlStub : public DynamicPartitionControlInterface {
+class DynamicPartitionControlStub final : public DynamicPartitionControlInterface {
  public:
   FeatureFlag GetDynamicPartitionsFeatureFlag() override;
   FeatureFlag GetVirtualAbFeatureFlag() override;
   FeatureFlag GetVirtualAbCompressionFeatureFlag() override;
+  FeatureFlag GetVirtualAbCompressionXorFeatureFlag() override;
   bool OptimizeOperation(const std::string& partition_name,
                          const InstallOperation& operation,
                          InstallOperation* optimized) override;
diff --git a/common/mock_dynamic_partition_control.h b/common/mock_dynamic_partition_control.h
index f3a446a..fd0a5a9 100644
--- a/common/mock_dynamic_partition_control.h
+++ b/common/mock_dynamic_partition_control.h
@@ -34,6 +34,10 @@
   MOCK_METHOD(bool, GetDeviceDir, (std::string*), (override));
   MOCK_METHOD(FeatureFlag, GetDynamicPartitionsFeatureFlag, (), (override));
   MOCK_METHOD(FeatureFlag, GetVirtualAbCompressionFeatureFlag, (), (override));
+  MOCK_METHOD(FeatureFlag,
+              GetVirtualAbCompressionXorFeatureFlag,
+              (),
+              (override));
   MOCK_METHOD(FeatureFlag, GetVirtualAbFeatureFlag, (), (override));
   MOCK_METHOD(bool, FinishUpdate, (bool), (override));
   MOCK_METHOD(std::unique_ptr<FileDescriptor>,