diff --git a/services/web/frontend/js/features/mathjax/load-mathjax.ts b/services/web/frontend/js/features/mathjax/load-mathjax.ts
index 0d9153ba56..c80d8a3d85 100644
--- a/services/web/frontend/js/features/mathjax/load-mathjax.ts
+++ b/services/web/frontend/js/features/mathjax/load-mathjax.ts
@@ -30,6 +30,10 @@ export const loadMathJax = async (options?: {
             // Implements support for the \bm command from the bm package. It bolds the argument in math mode.
             // https://github.com/mathjax/MathJax/issues/1219#issuecomment-341059843
             bm: ['\\boldsymbol{#1}', 1],
+            // MathJax 3 renders \coloneq as :- whereas the mathtools package
+            // renders it as :=. Here we override the \coloneq macro to produce
+            // the := symbol.
+            coloneq: '\\coloneqq',
           },
           inlineMath,
           displayMath: [