diff --git a/Makefile.emscripten b/Makefile.emscripten
index e99ccac..2826e45 100644
--- a/Makefile.emscripten
+++ b/Makefile.emscripten
@@ -12,7 +12,7 @@ EMPORTS := -s USE_SDL=2 -s USE_SDL_TTF=2
 EMFLAGS := $(EMPORTS)
 
 #EMFLAGS += -O1 -s SAFE_HEAP=1
-EMFLAGS += -O2
+EMFLAGS += -Oz
 
 EMFLAGS += -s EMTERPRETIFY=1 -s EMTERPRETIFY_ASYNC=1
 EMFLAGS += -s TOTAL_MEMORY=83886080