diff --git a/src/aio.c b/src/aio.c
index c63b91a..dd0a1e2 100644
--- a/src/aio.c
+++ b/src/aio.c
@@ -70,7 +70,7 @@ static void aio_set_pump_mode(libusb_device_handle* dev, const enum aio_pump_mod
 }
 
 static void aio_set_color(libusb_device_handle* dev, const enum aio_color_mode_t mode, const uint8_t speed, const struct rgb_t* colors, const uint8_t color_count) {
-	if (colors == NULL) // NOLINT no its not
+	if (colors == nullptr) // NOLINT no its not
 		return;
 
 	constexpr uint8_t modes[] = {0x52, 0x55, 0x55, 0x58};
@@ -132,7 +132,7 @@ static void aio_set_fan_curve(libusb_device_handle* dev, const struct curve_poin
 void aio_detect(struct aio_t *aio, const float t_quiet, const float t_balanced) {
 	libusb_init(nullptr);
 	aio->handle = libusb_open_device_with_vid_pid(nullptr, AIO_USB_VID, AIO_USB_PID);
-	if (aio->handle == NULL) {
+	if (aio->handle == nullptr) {
 		applog(LOG_ERR, "Can't open AIO USB device %x:%x", AIO_USB_VID, AIO_USB_PID);
 		return;
 	}
@@ -160,7 +160,7 @@ void aio_detect(struct aio_t *aio, const float t_quiet, const float t_balanced)
 }
 
 void aio_update(struct aio_t *aio) {
-	if (aio->handle == NULL)
+	if (aio->handle == nullptr)
 		return;
 
 	aio_usb_claim(aio->handle);
diff --git a/src/main.c b/src/main.c
index 68326b6..007968d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -83,7 +83,7 @@ static void *sensors_thread(void *arg) {
 
 	aio_close(&sensors->aio);
 	applog(LOG_WRN, "sensors thread stopped");
-	return NULL;
+	return nullptr;
 }
 
 static void *display_thread(void *arg) {
@@ -168,7 +168,7 @@ static void *display_thread(void *arg) {
 	lcd_flush_buf(&lcd);
 	lcd_close(&lcd);
 	applog(LOG_WRN, "display thread stopped");
-	return NULL;
+	return nullptr;
 }
 
 int main(void) {
@@ -181,7 +181,7 @@ int main(void) {
 
 	/* malloc memory for the struct */
 	struct sensors_t *sensors = malloc(sizeof(*sensors)); // no actual point in mallocing and it is ever so sligtly slower to access heap vs stack, but its cool
-	if (sensors == NULL) {
+	if (sensors == nullptr) {
 		applog(LOG_ERR, "can't allocate mem for the sensor struct. You don't got %lu bytes bro?", sizeof(*sensors));
 		return 1;
 	}
diff --git a/src/sys.c b/src/sys.c
index 59c7e97..635e234 100644
--- a/src/sys.c
+++ b/src/sys.c
@@ -31,7 +31,7 @@ void sys_get_ram(struct memory_t *ram) {
 	memset(ram, 0, sizeof(struct memory_t)); // zero out all values so we dont break out of the loop early
 
 	FILE *f = fopen("/proc/meminfo", "r");
-	if (f == NULL)
+	if (f == nullptr)
 		return;
 
 	while (fgets(buf, sizeof(buf), f)) {
diff --git a/src/utils.c b/src/utils.c
index 11829c5..be15c15 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -90,7 +90,7 @@ inline size_t read_file(const char *dir, const char *file, char *buffer, const s
 	strcpy(nt, file);	      // copy to the null terminator of prev copy, append basically
 	const int fd = open(path, O_RDONLY | O_CLOEXEC);
 	if (fd < 0) {
-		if (buffer != NULL) // if its null means we're just checking if it exists at all, so dont log it
+		if (buffer != nullptr) // if its null means we're just checking if it exists at all, so dont log it
 			applog(LOG_ERR, "Error reading %s", path);
 		return 0;
 	}