diff --git a/include/signal.h b/include/signal.h
index fe20cede39..7b11e3b5ac 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -167,6 +167,8 @@
 
 #define SIGIO           SIGPOLL
 
+#define SIGSYS          31
+
 /* sigprocmask() "how" definitions. Only one of the following can be specified: */
 
 #define SIG_BLOCK       1  /* Block the given signals */
diff --git a/sched/Kconfig b/sched/Kconfig
index 305d51d1c1..7ea9b8bee0 100644
--- a/sched/Kconfig
+++ b/sched/Kconfig
@@ -1372,8 +1372,8 @@ config SIG_SIGKILL_ACTION
 	default y
 	---help---
 		Enable the default action for SIGHUP SIGILL SIGTRAP SIGABRT SIGBUS
-		SIGFPE SIGINT SIGKILL SIGSEGV SIGQUIT SIGTERM SIGXCPU AND
-		SIGXFSZ (terminate the task).
+		SIGFPE SIGINT SIGKILL SIGSEGV SIGQUIT SIGTERM SIGXCPU  SIGXFSZ and
+		SIGSYS (terminate the task).
 
 config SIG_SIGUSR1_ACTION
 	bool "SIGUSR1"
diff --git a/sched/signal/sig_default.c b/sched/signal/sig_default.c
index baac89a1c5..f49c131f4d 100644
--- a/sched/signal/sig_default.c
+++ b/sched/signal/sig_default.c
@@ -119,6 +119,7 @@ static const struct nxsig_defaction_s g_defactions[] =
   { SIGTERM,   0,                nxsig_abnormal_termination },
   { SIGXCPU,   0,                nxsig_abnormal_termination },
   { SIGXFSZ,   0,                nxsig_abnormal_termination },
+  { SIGSYS,    0,                nxsig_abnormal_termination },
 #endif
 #ifdef CONFIG_SIG_SIGUSR1_ACTION
   { SIGUSR1,   0,                nxsig_abnormal_termination },