diff --git a/static/katex.less b/static/katex.less
index 19fb675e7..03ad4cafd 100644
--- a/static/katex.less
+++ b/static/katex.less
@@ -181,7 +181,7 @@ big parens
 
         // The rendering of $y'$, for example, looks bad without this.
         // TODO(alpert): Obviously incorrect. Figure out the proper fix here.
-        margin-left: 0.1em;
+        margin-left: 0.05em;
 
         .msup,
         .msub {