diff --git a/src/apps/installer/WorkerThread.cpp b/src/apps/installer/WorkerThread.cpp
index 6b0feeeaae..e7f9251b5a 100644
--- a/src/apps/installer/WorkerThread.cpp
+++ b/src/apps/installer/WorkerThread.cpp
@@ -527,6 +527,7 @@ WorkerThread::_MirrorIndices(const BPath& sourceDirectory,
 			continue;
 		}
 	}
+	fs_close_index_dir(indices);
 	return B_OK;
 }