diff --git a/setup.py b/setup.py
index ee4869d6..836f1d0e 100755
--- a/setup.py
+++ b/setup.py
@@ -13,16 +13,8 @@ import numpy
 
 compiler = distutils.ccompiler.new_compiler()
 
-if compiler.compiler_type == "unix":
-    if shutil.which("clang"):
-        os.environ["CC"] = "clang"
-        os.environ["CXX"] = "clang++"
-
-    extra_compile_args=["-O3", "-flto"]
-    extra_link_args=["-O3", "-flto"]
-else:
-    extra_compile_args=[]
-    extra_link_args=[]
+extra_compile_args=[]
+extra_link_args=[]
 
 setup(
     # name='ld-decode',