diff --git a/nshlib/nsh_builtin.c b/nshlib/nsh_builtin.c
index 4d8736644..264979d04 100644
--- a/nshlib/nsh_builtin.c
+++ b/nshlib/nsh_builtin.c
@@ -135,9 +135,9 @@ int nsh_builtin(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
         {
           int rc = 0;
 
-          /* Setup up to receive SIGKILL if control-C entered.  The return
+          /* Setup up to receive SIGINT if control-C entered.  The return
            * value is ignored because this console device may not support
-           * SIGKILL.
+           * SIGINT.
            */
 
           (void)ioctl(stdout->fs_fd, TIOCSCTTY, ret);
diff --git a/nshlib/nsh_fileapps.c b/nshlib/nsh_fileapps.c
index 868a26df2..4b1bcc3bd 100644
--- a/nshlib/nsh_fileapps.c
+++ b/nshlib/nsh_fileapps.c
@@ -172,9 +172,9 @@ int nsh_fileapp(FAR struct nsh_vtbl_s *vtbl, FAR const char *cmd,
         {
           int rc = 0;
 
-          /* Setup up to receive SIGKILL if control-C entered.  The return
+          /* Setup up to receive SIGINT if control-C entered.  The return
            * value is ignored because this console device may not support
-           * SIGKILL.
+           * SIGINT.
            */
 
           (void)ioctl(stdout->fs_fd, TIOCSCTTY, pid);
diff --git a/system/cu/cu_main.c b/system/cu/cu_main.c
index 570654974..0aa9b1975 100644
--- a/system/cu/cu_main.c
+++ b/system/cu/cu_main.c
@@ -61,18 +61,6 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#ifndef SIGINT
-#  define SIGINT  2
-#endif
-
-#ifndef SIGKILL
-#  define SIGKILL 9
-#endif
-
-#ifndef SIGTERM
-#  define SIGTERM 15
-#endif
-
 enum parity_mode
 {
   PARITY_NONE,
@@ -297,8 +285,6 @@ int cu_main(int argc, FAR char *argv[])
   memset(&sa, 0, sizeof(sa));
   sa.sa_handler = sigint;
   sigaction(SIGINT, &sa, NULL);
-  sigaction(SIGTERM, &sa, NULL);
-  sigaction(SIGKILL, &sa, NULL);
 
   while ((option = getopt(argc, argv, "l:s:eor?")) != ERROR)
     {