diff --git a/theme/boost/scss/moodle/icons.scss b/theme/boost/scss/moodle/icons.scss
index d1826a6a2cb..a0ad54e3089 100644
--- a/theme/boost/scss/moodle/icons.scss
+++ b/theme/boost/scss/moodle/icons.scss
@@ -25,6 +25,7 @@ $icon-big-height: 64px;
     &.iconsize-big {
         width: $icon-big-width;
         height: $icon-big-height;
+        font-size: $icon-big-height;
     }
 }