diff --git a/setup.py b/setup.py
index 3898ee5..eca9f5d 100644
--- a/setup.py
+++ b/setup.py
@@ -26,8 +26,8 @@ FLAGS = [
     "-Wall",
     "-Wextra",
     "-Wno-missing-field-initializers",
-    "--std=c++0x",
-    "-O3",
+    "--std=c++17",
+    "-O2",
     "-fPIC",
     '-DVERSION="{}"'.format(__version__)
 ]