diff --git a/Makefile b/Makefile
index 606ed94e..d7342acb 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ AR ?= $(CCPREFIX)ar
 PKG_CONFIG ?= pkg-config
 WX_CONFIG ?= wx-config
 PROTOC ?= protoc
-CFLAGS ?= -g -O0
+CFLAGS ?= -g -Os
 CXXFLAGS += -std=c++17
 LDFLAGS ?=
 PLATFORM ?= UNIX