diff --git a/Makefile b/Makefile
index a9416d0..1d7122f 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ PROTOCOL_VERSION?=104
 WIN_CC=x86_64-w64-mingw32-gcc
 WIN_CXX=x86_64-w64-mingw32-g++
 WIN_CFLAGS=-O3 #-g3 -fsanitize=address
-WIN_CXXFLAGS=-Wall -std=c++17 -O3 -DPROTOCOL_VERSION=$(PROTOCOL_VERSION) #-g3 -fsanitize=address
+WIN_CXXFLAGS=-Wall -std=c++17 -O2 -DPROTOCOL_VERSION=$(PROTOCOL_VERSION) #-g3 -fsanitize=address
 WIN_LDFLAGS=-static -lws2_32 -lwsock32 #-g3 -fsanitize=address
 WIN_SERVER=bin/winfusion.exe