diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 81e99e70964..69338c13ace 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,7 @@
+2016-09-22  Jason Merrill  <jason@redhat.com>
+
+	* configure.ac: Define HAVE_MEMALIGN for newlib.
+
 2015-09-23  Sebastian Huber  <sebastian.huber@embedded-brains.de>
 
 	* config/cpu/m68k/atomicity.h: Adjust comment.
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index ba471b08d10..04612bde76e 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -28824,6 +28824,8 @@ else
 
     $as_echo "#define HAVE_ICONV 1" >>confdefs.h
 
+    $as_echo "#define HAVE_MEMALIGN 1" >>confdefs.h
+
   else
 
 # Base decisions on target environment.
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 5657ecb27dc..baf605cfea6 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -324,6 +324,7 @@ else
     AC_DEFINE(HAVE_TANHF)
 
     AC_DEFINE(HAVE_ICONV)
+    AC_DEFINE(HAVE_MEMALIGN)
   else
     GLIBCXX_CROSSCONFIG
   fi