diff --git a/common/dynamic_partition_control_interface.h b/common/dynamic_partition_control_interface.h
index 2c01b1a..3f735bb 100644
--- a/common/dynamic_partition_control_interface.h
+++ b/common/dynamic_partition_control_interface.h
@@ -75,6 +75,9 @@
   virtual FeatureFlag GetVirtualAbCompressionFeatureFlag() = 0;
   // Return the feature flag for Virtual AB Compression XOR
   virtual FeatureFlag GetVirtualAbCompressionXorFeatureFlag() = 0;
+  // Returns whether userspace snapshots are enabled on the device, but not
+  // whether they're enabled for the update.
+  virtual FeatureFlag GetVirtualAbUserspaceSnapshotsFeatureFlag() = 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 6283b1d..ac11faf 100644
--- a/common/dynamic_partition_control_stub.cc
+++ b/common/dynamic_partition_control_stub.cc
@@ -42,6 +42,11 @@
   return FeatureFlag(FeatureFlag::Value::NONE);
 }
 
+FeatureFlag
+DynamicPartitionControlStub::GetVirtualAbUserspaceSnapshotsFeatureFlag() {
+  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 15137d2..4236051 100644
--- a/common/dynamic_partition_control_stub.h
+++ b/common/dynamic_partition_control_stub.h
@@ -33,6 +33,7 @@
   FeatureFlag GetVirtualAbFeatureFlag() override;
   FeatureFlag GetVirtualAbCompressionFeatureFlag() override;
   FeatureFlag GetVirtualAbCompressionXorFeatureFlag() override;
+  FeatureFlag GetVirtualAbUserspaceSnapshotsFeatureFlag() 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 fd0a5a9..8cff28f 100644
--- a/common/mock_dynamic_partition_control.h
+++ b/common/mock_dynamic_partition_control.h
@@ -38,6 +38,10 @@
               GetVirtualAbCompressionXorFeatureFlag,
               (),
               (override));
+  MOCK_METHOD(FeatureFlag,
+              GetVirtualAbUserspaceSnapshotsFeatureFlag,
+              (),
+              (override));
   MOCK_METHOD(FeatureFlag, GetVirtualAbFeatureFlag, (), (override));
   MOCK_METHOD(bool, FinishUpdate, (bool), (override));
   MOCK_METHOD(std::unique_ptr<FileDescriptor>,