diff --git a/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java b/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java
index c4617e85..e5272020 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java
@@ -3,9 +3,9 @@ package one.nem.lacerta.source.file.factory;
 import java.nio.file.Path;
 
 import dagger.assisted.AssistedFactory;
-import one.nem.lacerta.source.file.FileManager;
+import one.nem.lacerta.source.file.impl.FileManagerImpl;
 
 @AssistedFactory
 public interface FileManagerFactory {
-    FileManager create(Path rootDir);
+    FileManagerImpl create(Path rootDir);
 }
diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index 653cf1dc..f8c77012 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -12,6 +12,8 @@ import java.util.List;
 
 import javax.inject.Inject;
 
+import dagger.assisted.Assisted;
+import dagger.assisted.AssistedInject;
 import one.nem.lacerta.source.file.FileManager;
 
 public class FileManagerImpl implements FileManager {
@@ -32,9 +34,10 @@ public class FileManagerImpl implements FileManager {
         }
     }
 
-    @Inject
-    public FileManagerImpl(Path rootDir) {
-        // TODO-rca: 未実装
+    @AssistedInject
+    public FileManagerImpl(@Assisted Path rootDir) {
+        this.rootDir = rootDir;
+        this.currentDir = rootDir;
     }
 
     @Override