diff --git a/modules/ext.math.mathjax.js b/modules/ext.math.mathjax.js
index ca0e614d4..aaf09c7be 100644
--- a/modules/ext.math.mathjax.js
+++ b/modules/ext.math.mathjax.js
@@ -9,6 +9,31 @@
 			paths: {
 				mathjax: extensionAssetsPath + '/Math/modules/mathjax/es5'
 			}
+		},
+		// See https://phabricator.wikimedia.org/T375241 and the suggested startup function from
+		// https://github.com/mathjax/MathJax/issues/3030#issuecomment-1490520850
+		// This workaround will be included in the MathJax 4 release and no longer be
+		// required when we upgrade to MathJax 4.
+		startup: {
+			ready() {
+				const { Mml3 } = window.MathJax._.input.mathml.mml3.mml3;
+				window.MathJax.startup.defaultReady();
+				const mml3 = new Mml3( window.MathJax.startup.document );
+				const adaptor = window.MathJax.startup.document.adaptor;
+				const processor = new XSLTProcessor();
+				const parsed = adaptor.parse( Mml3.XSLT, 'text/xml' );
+				processor.importStylesheet( parsed );
+				mml3.transform = ( node ) => {
+					const div = adaptor.node( 'div', {}, [ adaptor.clone( node ) ] );
+					const dom = adaptor.parse( adaptor.serializeXML( div ), 'text/xml' );
+					const mml = processor.transformToDocument( dom );
+					return ( mml ? adaptor.tags( mml, 'math' )[ 0 ] : node );
+				};
+				// inputJax[0] did not work as per https://github.com/mathjax/MathJax/issues/3287#issuecomment-2363843017
+				const MML = window.MathJax.startup.document.inputJax[ 1 ];
+				MML.mmlFilters.items.pop(); // remove old filter
+				MML.mmlFilters.add( mml3.mmlFilter.bind( mml3 ) );
+			}
 		}
 	};
 }() );