diff --git a/lib/convert-worker.js b/lib/convert-worker.js
index 030d689..24d6b56 100644
--- a/lib/convert-worker.js
+++ b/lib/convert-worker.js
@@ -661,6 +661,7 @@ function fixHyphens(xml) {
   xml = xml.replace(/([Ss]hell) shocked/g, "$1-shocked");
   xml = xml.replace(/([Dd]og) tired/g, "$1-tired");
   xml = xml.replace(/([Nn]ightmare) filled/g, "$1-filled");
+  xml = xml.replace(/([Oo]ne) sided/g, "$1-sided");
   xml = xml.replace(/([Ss]elf) (conscious|esteem|loathing|harm|destruct|preservation)/g, "$1-$2");
   xml = xml.replace(/([Oo]ne|[Tt]wo|[Tt]hree|[Ff]our|[Ff]ourth) dimensional/g, "$1-dimensional");
   xml = xml.replace(/(?<=\b)([Oo]ne) on one(?=\b)/g, "$1-on-one");