diff --git a/cpukit/dev/can/can-bus.c b/cpukit/dev/can/can-bus.c
index 2feaac9289..d945b261d3 100644
--- a/cpukit/dev/can/can-bus.c
+++ b/cpukit/dev/can/can-bus.c
@@ -276,6 +276,10 @@ static int can_bus_open(
   mode_t mode
 )
 {
+  (void) path;
+  (void) oflag;
+  (void) mode;
+
   struct rtems_can_queue_ends_user_t *qends_user;
   struct rtems_can_queue_ends *qends;
   struct rtems_can_queue_edge *edge4read = NULL;
diff --git a/cpukit/dev/can/can-quekern.c b/cpukit/dev/can/can-quekern.c
index cad110911c..aab39f5699 100644
--- a/cpukit/dev/can/can-quekern.c
+++ b/cpukit/dev/can/can-quekern.c
@@ -85,6 +85,8 @@ static inline struct rtems_can_queue_edge *can_queue_dead_edges_cut_first( void
 
 static rtems_task can_queue_dead_func( rtems_task_argument arg )
 {
+  (void) arg;
+
   struct rtems_can_queue_edge *qedge;
   struct rtems_can_queue_ends *qends;
   struct rtems_can_queue_ends *entry;
diff --git a/cpukit/dev/can/can-queue.c b/cpukit/dev/can/can-queue.c
index 755504d743..326ef11b28 100644
--- a/cpukit/dev/can/can-queue.c
+++ b/cpukit/dev/can/can-queue.c
@@ -230,6 +230,8 @@ int rtems_can_queue_abort_inslot(
   struct rtems_can_queue_slot *slot
 )
 {
+  (void) qends;
+
   int ret;
 
   ret = rtems_can_queue_fifo_abort_inslot( &qedge->fifo, slot );
diff --git a/cpukit/dev/can/can-virtual.c b/cpukit/dev/can/can-virtual.c
index 79481eb1b8..9e942fcafb 100644
--- a/cpukit/dev/can/can-virtual.c
+++ b/cpukit/dev/can/can-virtual.c
@@ -132,6 +132,9 @@ static int virtual_chip_ioctl(
   void *arg
 )
 {
+  (void) chip;
+  (void) arg;
+
   int ret;
 
   switch( command ) {
diff --git a/cpukit/dev/can/ctucanfd/ctucanfd.c b/cpukit/dev/can/ctucanfd/ctucanfd.c
index 23d4b786c5..18b3b12c17 100644
--- a/cpukit/dev/can/ctucanfd/ctucanfd.c
+++ b/cpukit/dev/can/ctucanfd/ctucanfd.c
@@ -1442,6 +1442,9 @@ static int ctucanfd_chip_ioctl(
   void *arg
 )
 {
+  (void) chip;
+  (void) arg;
+
   int ret;
 
   switch( command ) {