diff --git a/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs b/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
index bf6ef18e15..1c5bf6f51b 100644
--- a/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
+++ b/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
@@ -696,6 +696,8 @@ const equationArrayEnvNames = new Set([
   'rcases*',
   'IEEEeqnarray',
   'IEEEeqnarray*',
+  'subeqnarray',
+  'subeqnarray*',
 ])
 
 const verbatimEnvNames = new Set([