diff --git a/lib/bcc/Compiler.cpp b/lib/bcc/Compiler.cpp
index dd7328e..6ab1dd3 100644
--- a/lib/bcc/Compiler.cpp
+++ b/lib/bcc/Compiler.cpp
@@ -236,7 +236,7 @@
   // -O1: llvm::CodeGenOpt::Less
   // -O2: llvm::CodeGenOpt::Default
   // -O3: llvm::CodeGenOpt::Aggressive
-  CodeGenOptLevel = llvm::CodeGenOpt::None;
+  CodeGenOptLevel = llvm::CodeGenOpt::Aggressive;
 
   // Below are the global settings to LLVM