diff --git a/linters/tox.ini b/linters/tox.ini
index 8abf8fb..c945456 100644
--- a/linters/tox.ini
+++ b/linters/tox.ini
@@ -9,7 +9,6 @@ changedir = /src
 [testenv:cppcheck]
 allowlist_externals = cppcheck
 commands = cppcheck \
-			-j4 \
 			--force \
 			--std=c17 \
 			--error-exitcode=1 \
diff --git a/src/libs/process.h b/src/libs/process.h
index 5bb16a4..e146c5b 100644
--- a/src/libs/process.h
+++ b/src/libs/process.h
@@ -98,7 +98,7 @@ INLINE int us_process_track_parent_death(void) {
 #ifdef WITH_SETPROCTITLE
 #	pragma GCC diagnostic ignored "-Wunused-parameter"
 #	pragma GCC diagnostic push
-INLINE void us_process_set_name_prefix(int argc, char *argv[], const char *prefix) {
+INLINE void us_process_set_name_prefix(int argc, const char *argv[], const char *prefix) {
 #	pragma GCC diagnostic pop
 
 	char *cmdline = NULL;
diff --git a/src/ustreamer/device.c b/src/ustreamer/device.c
index bab778c..6864d82 100644
--- a/src/ustreamer/device.c
+++ b/src/ustreamer/device.c
@@ -71,7 +71,7 @@ static int _device_query_control(
 	us_device_s *dev, struct v4l2_queryctrl *query,
 	const char *name, unsigned cid, bool quiet);
 static void _device_set_control(
-	us_device_s *dev, struct v4l2_queryctrl *query,
+	us_device_s *dev, const struct v4l2_queryctrl *query,
 	const char *name, unsigned cid, int value, bool quiet);
 
 static const char *_format_to_string_nullable(unsigned format);
@@ -843,7 +843,7 @@ static int _device_query_control(
 }
 
 static void _device_set_control(
-	us_device_s *dev, struct v4l2_queryctrl *query,
+	us_device_s *dev, const struct v4l2_queryctrl *query,
 	const char *name, unsigned cid, int value, bool quiet) {
 
 	if (value < query->minimum || value > query->maximum || value % query->step != 0) {
diff --git a/src/ustreamer/encoder.c b/src/ustreamer/encoder.c
index 5181d09..83e49e9 100644
--- a/src/ustreamer/encoder.c
+++ b/src/ustreamer/encoder.c
@@ -195,7 +195,7 @@ static void _worker_job_destroy(void *v_job) {
 static bool _worker_run_job(us_worker_s *wr) {
 	us_encoder_job_s *job = (us_encoder_job_s *)wr->job;
 	us_encoder_s *enc = job->enc; // Just for _ER()
-	us_frame_s *src = &job->hw->raw;
+	const us_frame_s *src = &job->hw->raw;
 	us_frame_s *dest = job->dest;
 
 	assert(_ER(type) != US_ENCODER_TYPE_UNKNOWN);
diff --git a/src/ustreamer/options.c b/src/ustreamer/options.c
index 86af020..52d6a36 100644
--- a/src/ustreamer/options.c
+++ b/src/ustreamer/options.c
@@ -233,7 +233,7 @@ static int _parse_resolution(const char *str, unsigned *width, unsigned *height,
 static int _check_instance_id(const char *str);
 
 static void _features(void);
-static void _help(FILE *fp, us_device_s *dev, us_encoder_s *enc, us_stream_s *stream, us_server_s *server);
+static void _help(FILE *fp, const us_device_s *dev, const us_encoder_s *enc, const us_stream_s *stream, const us_server_s *server);
 
 
 us_options_s *us_options_init(unsigned argc, char *argv[]) {
@@ -586,7 +586,7 @@ static void _features(void) {
 #	endif
 }
 
-static void _help(FILE *fp, us_device_s *dev, us_encoder_s *enc, us_stream_s *stream, us_server_s *server) {
+static void _help(FILE *fp, const us_device_s *dev, const us_encoder_s *enc, const us_stream_s *stream, const us_server_s *server) {
 #	define SAY(x_msg, ...) fprintf(fp, x_msg "\n", ##__VA_ARGS__)
 	SAY("\nuStreamer - Lightweight and fast MJPEG-HTTP streamer");
 	SAY("═══════════════════════════════════════════════════");
diff --git a/src/ustreamer/workers.c b/src/ustreamer/workers.c
index deed7cc..85b4c04 100644
--- a/src/ustreamer/workers.c
+++ b/src/ustreamer/workers.c
@@ -157,7 +157,7 @@ void us_workers_pool_assign(us_workers_pool_s *pool, us_worker_s *ready_wr/*, vo
 	US_MUTEX_UNLOCK(pool->free_workers_mutex);
 }
 
-long double us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, us_worker_s *ready_wr) {
+long double us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, const us_worker_s *ready_wr) {
 	const long double approx_job_time = pool->approx_job_time * 0.9 + ready_wr->last_job_time * 0.1;
 
 	US_LOG_VERBOSE("Correcting pool's %s approx_job_time: %.3Lf -> %.3Lf (last_job_time=%.3Lf)",
diff --git a/src/ustreamer/workers.h b/src/ustreamer/workers.h
index c170b45..44935cf 100644
--- a/src/ustreamer/workers.h
+++ b/src/ustreamer/workers.h
@@ -92,4 +92,4 @@ void us_workers_pool_destroy(us_workers_pool_s *pool);
 us_worker_s *us_workers_pool_wait(us_workers_pool_s *pool);
 void us_workers_pool_assign(us_workers_pool_s *pool, us_worker_s *ready_wr/*, void *job*/);
 
-long double us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, us_worker_s *ready_wr);
+long double us_workers_pool_get_fluency_delay(us_workers_pool_s *pool, const us_worker_s *ready_wr);