diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 6d9a8875e31..635168d7e25 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -1562,7 +1562,7 @@ AC_DEFUN([GLIBCXX_ENABLE_LIBSTDCXX_TIME], [
   fi
 
   if test x"$ac_no_sleep" = x"yes"; then
-    AC_DEFINE(NO_SLEEP,1, [Defined if no way to sleep is available.])
+    AC_DEFINE(_GLIBCXX_NO_SLEEP,1, [Defined if no way to sleep is available.])
   fi
 
   AC_SUBST(GLIBCXX_LIBS)
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index 420021fcb1a..10675fe2530 100644
--- a/libstdc++-v3/config.h.in
+++ b/libstdc++-v3/config.h.in
@@ -714,9 +714,6 @@
    */
 #undef LT_OBJDIR
 
-/* Defined if no way to sleep is available. */
-#undef NO_SLEEP
-
 /* Name of package */
 #undef PACKAGE
 
@@ -838,6 +835,9 @@
 /* Define if C99 llrint and llround functions are missing from <math.h>. */
 #undef _GLIBCXX_NO_C99_ROUNDING_FUNCS
 
+/* Defined if no way to sleep is available. */
+#undef _GLIBCXX_NO_SLEEP
+
 /* Define if ptrdiff_t is int. */
 #undef _GLIBCXX_PTRDIFF_T_IS_INT
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 61a14a2cb3b..b1a0157d0b9 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -21006,7 +21006,7 @@ $as_echo "$ac_has_win32_sleep" >&6; }
 
   if test x"$ac_no_sleep" = x"yes"; then
 
-$as_echo "#define NO_SLEEP 1" >>confdefs.h
+$as_echo "#define _GLIBCXX_NO_SLEEP 1" >>confdefs.h
 
   fi