diff --git a/buildTree.js b/buildTree.js
index b5f2dcac0..dec2fe6fb 100644
--- a/buildTree.js
+++ b/buildTree.js
@@ -346,7 +346,7 @@ var groupTypes = {
                 options.withSize(group.value.size), prev);
 
         return makeSpan(
-            ["reset-" + options.size, group.value.size,
+            ["sizing", "reset-" + options.size, group.value.size,
                 getTypeOfGroup(group.value.value)],
             [inner]);
     }
diff --git a/static/katex.less b/static/katex.less
index f026bd474..9cf742a16 100644
--- a/static/katex.less
+++ b/static/katex.less
@@ -289,6 +289,8 @@ big parens
         }
     }
 
+    .sizing { display: inline-block; }
+
     .reset-size5.size1 { font-size: 0.5em; }
     .reset-size5.size2 { font-size: 0.7em; }
     .reset-size5.size3 { font-size: 0.8em; }