diff --git a/tools/rime_deployer.cc b/tools/rime_deployer.cc
index d2dffcf9f4..655353818a 100644
--- a/tools/rime_deployer.cc
+++ b/tools/rime_deployer.cc
@@ -12,7 +12,7 @@
 #include <rime/setup.h>
 #include <rime/lever/deployment_tasks.h>
 
-using namespace fs = boost::filesystem;
+namespace fs = boost::filesystem;
 
 using namespace rime;