diff --git a/Makefile b/Makefile
index 9d02f0c..d99c484 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ ODIR_SHARED=obj_so
 NAME = libztd
 
 CC=g++
-CXXFLAGS= -I$(IDIR) -Wall -pedantic -std=c++17
+CXXFLAGS= -I$(IDIR) -Wall -pedantic -std=c++17 -O2
 ifeq	 ($(DEBUG),true)
 	CXXFLAGS += -g
 endif