diff --git a/ts/output/chtml/Wrappers/math.ts b/ts/output/chtml/Wrappers/math.ts
index 5f44937f8..7f9465ec0 100644
--- a/ts/output/chtml/Wrappers/math.ts
+++ b/ts/output/chtml/Wrappers/math.ts
@@ -57,6 +57,7 @@ CommonMathMixin>(CHTMLWrapper) {
'font-size': '100%',
'font-size-adjust': 'none',
'letter-spacing': 'normal',
+ 'border-collapse': 'collapse',
'word-wrap': 'normal',
'word-spacing': 'normal',
'white-space': 'nowrap',