diff --git a/opt.cpp b/opt.cpp
index 337031bc..fd4f1709 100644
--- a/opt.cpp
+++ b/opt.cpp
@@ -204,6 +204,7 @@ Optimize(llvm::Module *module, int optLevel) {
         optPM.add(CreateIsCompileTimeConstantPass(true));
         optPM.add(llvm::createFunctionInliningPass());
         optPM.add(CreateMakeInternalFuncsStaticPass());
+        optPM.add(llvm::createCFGSimplificationPass());
         optPM.add(llvm::createGlobalDCEPass());
     }
     else {