diff --git a/theme/boost/pix/blocksdrawer.png b/theme/boost/pix/blocksdrawer.png
deleted file mode 100644
index a296436a705..00000000000
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diff --git a/theme/boost/pix/blocksdrawer.svg b/theme/boost/pix/blocksdrawer.svg
deleted file mode 100644
index eac1f212149..00000000000
--- a/theme/boost/pix/blocksdrawer.svg
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Adobe Illustrator 20.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
-<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
-	 viewBox="0 0 40 40" style="enable-background:new 0 0 40 40;" xml:space="preserve">
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diff --git a/theme/boost/pix/glyphicons-halflings-white.png b/theme/boost/pix/glyphicons-halflings-white.png
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index a991ecec1d6..00000000000
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diff --git a/theme/boost/pix/glyphicons-halflings.png b/theme/boost/pix/glyphicons-halflings.png
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index aad6c823abe..00000000000
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diff --git a/theme/boost/pix/header.jpg b/theme/boost/pix/header.jpg
deleted file mode 100644
index 3e85176f521..00000000000
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diff --git a/theme/boost/pix/horizontal-menu-submenu-indicator.png b/theme/boost/pix/horizontal-menu-submenu-indicator.png
deleted file mode 100644
index f4652633212..00000000000
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diff --git a/theme/boost/pix/screenshot.jpg b/theme/boost/pix/screenshot.jpg
index adfbdc1596b..7ad3b0d1855 100644
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diff --git a/theme/boost/pix/sprite.png b/theme/boost/pix/sprite.png
deleted file mode 100644
index b2a31cd8903..00000000000
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diff --git a/theme/boost/pix/vertical-menu-submenu-indicator.png b/theme/boost/pix/vertical-menu-submenu-indicator.png
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index bbd80448824..00000000000
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diff --git a/theme/boost/scss/moodle.scss b/theme/boost/scss/moodle.scss
index c92deac3508..ba84d8e71ff 100644
--- a/theme/boost/scss/moodle.scss
+++ b/theme/boost/scss/moodle.scss
@@ -1,7 +1,4 @@
 // Set image location.
-$iconSpritePath:          "[[pix:theme|glyphicons-halflings]]" !default;
-$iconWhiteSpritePath:     "[[pix:theme|glyphicons-halflings-white]]" !default;
-
 $breadcrumb-divider: "▶" !default;
 $breadcrumb-divider-rtl: "◀" !default;