diff -Nru gnome-themes-standard-3.18.0/debian/changelog gnome-themes-standard-3.18.0/debian/changelog
--- gnome-themes-standard-3.18.0/debian/changelog	2015-12-29 15:48:39.000000000 +0000
+++ gnome-themes-standard-3.18.0/debian/changelog	2018-02-08 06:55:43.000000000 +0000
@@ -1,3 +1,9 @@
+gnome-themes-standard (3.18.0-2ubuntu2) xenial; urgency=medium
+
+  * Use HighContrast icons for the HighContrast theme. (LP: #1644662)
+
+ -- Dariusz Gadomski <dariusz.gadomski@canonical.com>  Thu, 08 Feb 2018 07:55:43 +0100
+
 gnome-themes-standard (3.18.0-2ubuntu1) xenial; urgency=medium
 
   * Merge with Debian unstable, remaining changes:
diff -Nru gnome-themes-standard-3.18.0/debian/patches/hc-icons.patch gnome-themes-standard-3.18.0/debian/patches/hc-icons.patch
--- gnome-themes-standard-3.18.0/debian/patches/hc-icons.patch	1970-01-01 00:00:00.000000000 +0000
+++ gnome-themes-standard-3.18.0/debian/patches/hc-icons.patch	2018-02-08 06:55:43.000000000 +0000
@@ -0,0 +1,25 @@
+Description: use HighContrast icons for HighContrast theme
+ Adwaita is missing some icons used e.g. in the System Settings.
+ Replacing the icon set for HighContrast theme results in no
+ missing icons in the settings app. However, some icons missing
+ from the HighContrast set are replaced by their Adwaita counterparts.
+ .
+ gnome-themes-standard (3.18.0-2ubuntu2) xenial; urgency=medium
+ .
+   * Use HighContrast icons for the HighContrast theme. (LP: #1644662)
+Origin: upstream, https://gitlab.gnome.org/GNOME/gnome-themes-extra/commit/b6b8c4840d0f97c925448fa416cf3eb3195f052c
+Bug-Ubuntu: https://bugs.launchpad.net/bugs/1644662
+Last-Update: 2018-02-08
+
+Index: gnome-themes-standard-3.18.0/themes/HighContrast/index.theme
+===================================================================
+--- gnome-themes-standard-3.18.0.orig/themes/HighContrast/index.theme
++++ gnome-themes-standard-3.18.0/themes/HighContrast/index.theme
+@@ -145,6 +145,6 @@ Comment[zh_TW]=高對比主題
+ Encoding=UTF-8
+ GtkTheme=HighContrast
+ MetacityTheme=HighContrast
+-IconTheme=Adwaita
++IconTheme=HighContrast
+ CursorTheme=Adwaita
+ CursorSize=24
diff -Nru gnome-themes-standard-3.18.0/debian/patches/series gnome-themes-standard-3.18.0/debian/patches/series
--- gnome-themes-standard-3.18.0/debian/patches/series	2015-12-29 15:48:39.000000000 +0000
+++ gnome-themes-standard-3.18.0/debian/patches/series	2018-02-08 06:55:43.000000000 +0000
@@ -1,2 +1,3 @@
 01_gtk-update-icon-cache_name.patch
 ubuntu_a11y_fallback.patch
+hc-icons.patch