diff --git a/src/app_config.c b/src/app_config.c
index ed828771..8f7e6812 100644
--- a/src/app_config.c
+++ b/src/app_config.c
@@ -1,6 +1,6 @@
 #include "app_config.h"
 
-const char *appconf_paths[] = {"./divinus.yaml", "/etc/divinus.yaml"};
+const char *appconf_paths[] = {"./divinus.yaml", "/etc/divinus.yaml", NULL};
 
 struct AppConfig app_config;
 
diff --git a/src/gpio.c b/src/gpio.c
index cb19919d..65e07628 100644
--- a/src/gpio.c
+++ b/src/gpio.c
@@ -12,7 +12,7 @@ void gpio_deinit(void) {
 }
 
 int gpio_init(void) {
-    const char *paths[] = {"/dev/gpiochip0", "/sys/class/gpio/gpiochip0"};
+    const char *paths[] = {"/dev/gpiochip0", "/sys/class/gpio/gpiochip0", NULL};
     const char **path = paths;
     while (*path) {
         if (access(*path++, F_OK)) continue;
diff --git a/src/watchdog.c b/src/watchdog.c
index 18206898..1db88774 100644
--- a/src/watchdog.c
+++ b/src/watchdog.c
@@ -9,7 +9,7 @@ void watchdog_reset(void) {
 
 int watchdog_start(int timeout) {
     if (fd) return EXIT_SUCCESS;
-    const char* paths[] = {"/dev/watchdog0", "/dev/watchdog"};
+    const char* paths[] = {"/dev/watchdog0", "/dev/watchdog", NULL};
     const char **path = paths;
 
     while (*path) {