diff --git a/external/cddl/osnet/dist/tools/ctf/common/memory.c b/external/cddl/osnet/dist/tools/ctf/common/memory.c
index e16044a8b672..964ca588a2ef 100644
--- a/external/cddl/osnet/dist/tools/ctf/common/memory.c
+++ b/external/cddl/osnet/dist/tools/ctf/common/memory.c
@@ -37,7 +37,7 @@
 #include <strings.h>
 #include "memory.h"
 
-static void
+static void __dead
 memory_bailout(void)
 {
 	(void) fprintf(stderr, "Out of memory\n");
diff --git a/external/cddl/osnet/dist/tools/ctf/cvt/ctfmerge.c b/external/cddl/osnet/dist/tools/ctf/cvt/ctfmerge.c
index e73809004f0e..7f317fb9e0a5 100644
--- a/external/cddl/osnet/dist/tools/ctf/cvt/ctfmerge.c
+++ b/external/cddl/osnet/dist/tools/ctf/cvt/ctfmerge.c
@@ -607,7 +607,7 @@ merge_ctf_cb(tdata_t *td, char *name, void *arg)
  * completion.  The run time of ctfmerge can, however, be measured in minutes
  * in some cases, so this is not a valid option.
  */
-static void
+static void __dead
 handle_sig(int sig)
 {
 	terminate("Caught signal %d - exiting\n", sig);