diff --git a/Makefile b/Makefile
index f7f4fda6f..0cc979b75 100644
--- a/Makefile
+++ b/Makefile
@@ -54,9 +54,9 @@ endif
 
 ARCHFLAGS := $(ARCHFLAGS)
 
-OPTFLAGS  ?= -g -O3
+OPTFLAGS  ?= -g -O
 
-CFLAGS    += -std=c17 -Wall -Wno-unused-function -Wno-write-strings -Wno-sign-compare $(ARCHFLAGS)
+CFLAGS    += -Wall -Wno-unused-function -Wno-write-strings -Wno-sign-compare $(ARCHFLAGS)
 ifneq ($(findstring arm,$(shell uname -m)),)
 	CFLAGS += -DABC_MEMALIGN=4
 endif