diff --git a/fs_mgr/liblp/builder.cpp b/fs_mgr/liblp/builder.cpp
index 33ea8c5..e789524 100644
--- a/fs_mgr/liblp/builder.cpp
+++ b/fs_mgr/liblp/builder.cpp
@@ -140,7 +140,7 @@
     }
     if (opener) {
         for (size_t i = 0; i < builder->block_devices_.size(); i++) {
-            std::string partition_name = GetBlockDevicePartitionName(builder->block_devices_[i]);
+            std::string partition_name = builder->GetBlockDevicePartitionName(i);
             BlockDeviceInfo device_info;
             if (opener->GetInfo(partition_name, &device_info)) {
                 builder->UpdateBlockDeviceInfo(i, device_info);
@@ -164,7 +164,7 @@
     // name and system properties.
     // See comments for UpdateMetadataForOtherSuper.
     auto super_device = GetMetadataSuperBlockDevice(*metadata.get());
-    if (GetBlockDevicePartitionName(*super_device) != "super" &&
+    if (android::fs_mgr::GetBlockDevicePartitionName(*super_device) != "super" &&
         IsRetrofitDynamicPartitionsDevice()) {
         if (!UpdateMetadataForOtherSuper(metadata.get(), source_slot_number, target_slot_number)) {
             return nullptr;
@@ -192,7 +192,8 @@
     // Translate block devices.
     auto source_block_devices = std::move(metadata->block_devices);
     for (const auto& source_block_device : source_block_devices) {
-        std::string partition_name = GetBlockDevicePartitionName(source_block_device);
+        std::string partition_name =
+                android::fs_mgr::GetBlockDevicePartitionName(source_block_device);
         std::string slot_suffix = GetPartitionSlotSuffix(partition_name);
         if (slot_suffix.empty() || slot_suffix != source_slot_suffix) {
             // This should never happen. It means that the source metadata
@@ -375,7 +376,7 @@
             block_devices_.emplace_back(out);
         }
     }
-    if (GetBlockDevicePartitionName(block_devices_[0]) != super_partition) {
+    if (GetBlockDevicePartitionName(0) != super_partition) {
         LERROR << "No super partition was specified.";
         return false;
     }
@@ -849,7 +850,7 @@
 bool MetadataBuilder::FindBlockDeviceByName(const std::string& partition_name,
                                             uint32_t* index) const {
     for (size_t i = 0; i < block_devices_.size(); i++) {
-        if (GetBlockDevicePartitionName(block_devices_[i]) == partition_name) {
+        if (GetBlockDevicePartitionName(i) == partition_name) {
             *index = i;
             return true;
         }
@@ -974,7 +975,8 @@
     // Note: we don't compare alignment, since it's a performance thing and
     // won't affect whether old extents continue to work.
     return first.first_logical_sector == second.first_logical_sector && first.size == second.size &&
-           GetBlockDevicePartitionName(first) == GetBlockDevicePartitionName(second);
+           android::fs_mgr::GetBlockDevicePartitionName(first) ==
+                   android::fs_mgr::GetBlockDevicePartitionName(second);
 }
 
 bool MetadataBuilder::ImportPartitions(const LpMetadata& metadata,
@@ -1057,7 +1059,7 @@
 }
 
 bool MetadataBuilder::IsRetrofitMetadata() const {
-    return GetBlockDevicePartitionName(block_devices_[0]) != LP_METADATA_DEFAULT_PARTITION_NAME;
+    return GetBlockDevicePartitionName(0) != LP_METADATA_DEFAULT_PARTITION_NAME;
 }
 
 bool MetadataBuilder::AddLinearExtent(Partition* partition, const std::string& block_device,
@@ -1121,5 +1123,11 @@
     return true;
 }
 
+std::string MetadataBuilder::GetBlockDevicePartitionName(uint64_t index) const {
+    return index < block_devices_.size()
+                   ? android::fs_mgr::GetBlockDevicePartitionName(block_devices_[index])
+                   : "";
+}
+
 }  // namespace fs_mgr
 }  // namespace android
diff --git a/fs_mgr/liblp/include/liblp/builder.h b/fs_mgr/liblp/include/liblp/builder.h
index d2a206b..1f7029e 100644
--- a/fs_mgr/liblp/include/liblp/builder.h
+++ b/fs_mgr/liblp/include/liblp/builder.h
@@ -287,6 +287,9 @@
     // Return true if a block device is found, else false.
     bool HasBlockDevice(const std::string& partition_name) const;
 
+    // Return the name of the block device at |index|.
+    std::string GetBlockDevicePartitionName(uint64_t index) const;
+
   private:
     MetadataBuilder();
     MetadataBuilder(const MetadataBuilder&) = delete;