diff --git a/fs_mgr/libsnapshot/cow_writer.cpp b/fs_mgr/libsnapshot/cow_writer.cpp
index 0a7ceab..526fede 100644
--- a/fs_mgr/libsnapshot/cow_writer.cpp
+++ b/fs_mgr/libsnapshot/cow_writer.cpp
@@ -76,7 +76,7 @@
     return EmitLabel(label);
 }
 
-bool AddSequenceData(size_t /*num_ops*/, const uint32_t* /*data*/) {
+bool ICowWriter::AddSequenceData(size_t /*num_ops*/, const uint32_t* /*data*/) {
     LOG(ERROR) << "AddSequenceData not yet implemented";
     return false;
 }