diff --git a/Makefile b/Makefile
index 1ae5808..08886cc 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,9 @@ MAKEFLAGS := --jobs=16
 # MAKEFLAGS += --output-sync=target
 
 # compiling with C++26
-CXXFLAGS := -std=c++2c -Ofast -fdiagnostics-color=always -Iinclude -lwebsockets -D_GLIBCXX_USE_CXX11_ABI=0
+CXXFLAGS := -std=c++2c -fdiagnostics-color=always -Iinclude -lwebsockets
 CXXFLAGS += -MMD -MP
+CXXFLAGS += -O
 
 SOURCES := main.cpp $(wildcard src/*.cpp)
 OBJECTS := $(SOURCES:.cpp=.o)