diff --git a/src/Makefile b/src/Makefile
index 566e7dc7..6c1adc19 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -13,7 +13,7 @@ LIBS = -L$(WINDIVERTLIBS) -lWinDivert -lws2_32 -l:libssp.a
 CC = $(CPREFIX)gcc
 CCWINDRES = $(CPREFIX)windres
 CFLAGS = -std=c2x -pie -fPIE -pipe -I$(WINDIVERTHEADERS) -L$(WINDIVERTLIBS) \
-         -O2 -D_FORTIFY_SOURCE=2 -fstack-protector \
+         -O3 -flto -D_FORTIFY_SOURCE=2 -fstack-protector \
          -Wall -Wextra -Wpedantic -Wformat=2 -Wformat-overflow=2 -Wformat-truncation=2 \
          -Wformat-security -Wno-format-nonliteral -Wshadow -Wstrict-aliasing=1 \
          -Wnull-dereference -Warray-bounds=2 -Wimplicit-fallthrough=3 \