diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index 837c2ddef5b..c183dec9e08 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -22,8 +22,6 @@
 #include <fstream>
 #include <memory>
 
-using namespace opt;
-
 enum Opts {
   // Basic optimizations
   dce, constprop, inlining, mergecons, strip, mstrip,