diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 1b61ec79360..c76324ccdd3 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,10 @@
+2018-08-10  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	PR target/85904
+	* configure.ac: Define HAVE_ALIGNED_ALLOC if building for
+	Newlib.
+	* configure: Regenerate.
+
 2018-08-10  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/std/deque (std::pmr::deque): Declare alias.
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index d33081d544c..53803b7e599 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -28967,6 +28967,8 @@ else
     $as_echo "#define HAVE_TANHF 1" >>confdefs.h
 
 
+    $as_echo "#define HAVE_ALIGNED_ALLOC 1" >>confdefs.h
+
     $as_echo "#define HAVE_ICONV 1" >>confdefs.h
 
     $as_echo "#define HAVE_MEMALIGN 1" >>confdefs.h
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 332af3706d3..e15228dde5e 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -330,6 +330,7 @@ else
     AC_DEFINE(HAVE_TANF)
     AC_DEFINE(HAVE_TANHF)
 
+    AC_DEFINE(HAVE_ALIGNED_ALLOC)
     AC_DEFINE(HAVE_ICONV)
     AC_DEFINE(HAVE_MEMALIGN)
   else