diff --git a/Makefile b/Makefile
index 2f07ace..6781c60 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ CFG_DIR = $(BASE_DIR)/cfg
 
 LIBS = libtoxcore ncursesw libconfig libqrencode
 
-CFLAGS = -std=gnu99 -pthread -Wall -g
+CFLAGS = -std=gnu99 -pthread -Wall -g -fstack-protector-all
 CFLAGS += '-DTOXICVER="$(VERSION)"' -DHAVE_WIDECHAR -D_XOPEN_SOURCE_EXTENDED -D_FILE_OFFSET_BITS=64
 CFLAGS += '-DPACKAGE_DATADIR="$(abspath $(DATADIR))"'
 CFLAGS += $(USER_CFLAGS)
diff --git a/src/qr_code.c b/src/qr_code.c
index e496c8c..1341126 100644
--- a/src/qr_code.c
+++ b/src/qr_code.c
@@ -28,7 +28,6 @@
 #include "windows.h"
 #include "qr_code.h"
 
-#define BORDER_CHAR "|"
 #define BORDER_LEN 1
 #define CHAR_1 "\342\226\210"
 #define CHAR_2 "\342\226\204"