diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index c9b4922dc961..564015d0899f 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-30  Corentin Gay  <gay@adacore.com>
+
+	* acinclude.m4 (vxworks*): New entry. Set ac_has_nanosleep=yes.
+	* configure: Regenerate.
+
 2019-12-30  Jerome Lambourg  <lambourg@adacore.com>
             Olivier Hainque  <hainque@adacore.com>
 
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index c0d1059c6ed6..c537a2688ddc 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1407,6 +1407,11 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
         ac_has_nanosleep=yes
         ac_has_sched_yield=yes
         ;;
+      # VxWorks has nanosleep as soon as the kernel is configured with
+      # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
+      vxworks*)
+        ac_has_nanosleep=yes
+        ;;
       gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
         AC_MSG_CHECKING([for at least GNU libc 2.17])
         AC_TRY_COMPILE(
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index d96bd1457ec9..d2e516df6d09 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -21060,6 +21060,11 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
         ac_has_nanosleep=yes
         ac_has_sched_yield=yes
         ;;
+      # VxWorks has nanosleep as soon as the kernel is configured with
+      # INCLUDE_POSIX_TIMERS, which is normally/most-often the case.
+      vxworks*)
+        ac_has_nanosleep=yes
+        ;;
       gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
         { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at least GNU libc 2.17" >&5
 $as_echo_n "checking for at least GNU libc 2.17... " >&6; }