diff --git a/libut/Makefile b/libut/Makefile
index 6143588..f67ff06 100644
--- a/libut/Makefile
+++ b/libut/Makefile
@@ -4,6 +4,7 @@ INCDIR=./include
 CFLAGS+=-I$(INCDIR)
 CFLAGS+=-Wall -Wextra
 CFLAGS+=-g
+CFLAGS+=-fstack-protector-strong
 
 libut.a: libut.o utvector.o utmm.o ringbuf.o
 	ar r $@ $^