diff --git a/lms/static/sass/discussion/_mixins.scss b/lms/static/sass/discussion/_mixins.scss
index b5e13fd923..b0ff8ac283 100644
--- a/lms/static/sass/discussion/_mixins.scss
+++ b/lms/static/sass/discussion/_mixins.scss
@@ -75,6 +75,10 @@
     @include padding-left($baseline*2);
     @include padding-right(0);
   }
+
+  svg {
+    max-width: 100%;
+  }
 }
 
 @-webkit-keyframes fadeIn {