diff --git a/sass/understrap/understrap.scss b/sass/understrap/understrap.scss
index abd3dfa..7b523bb 100644
--- a/sass/understrap/understrap.scss
+++ b/sass/understrap/understrap.scss
@@ -38,7 +38,7 @@
   margin-left: 1.5em;
 }
 
-.aligncenter { margin: 0px auto; }
+.aligncenter { @extend .mx-auto; }
 
 // Post design
 .entry-footer span { padding-right: 10px; }