diff --git a/lib/convert-worker.js b/lib/convert-worker.js
index 40ab0ab..6f52ab1 100644
--- a/lib/convert-worker.js
+++ b/lib/convert-worker.js
@@ -600,6 +600,7 @@ function fixHyphens(xml) {
   xml = xml.replace(/able bodied/g, "able-bodied");
   xml = xml.replace(/self conscious/g, "self-conscious");
   xml = xml.replace(/([Oo]ne|[Tt]wo|[Tt]hree|[Ff]our|[Ff]ourth) dimensional/g, "$1-dimensional");
+  xml = xml.replace(/(?<=\b)one on one(?=\b)/g, "one-on-one");
 
   // This is usually correct but sometimes wrong.
   xml = xml.replace(/neo /g, "neo-");