diff --git a/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar b/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
index 4eb8ef09da..03c44b75e6 100644
--- a/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
+++ b/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
@@ -628,6 +628,9 @@ Math {
     | Label {
         LabelCtrlSeq optionalWhitespace? OptionalArgument? LabelArgument
     }
+    | Ref {
+        (RefCtrlSeq | RefStarrableCtrlSeq "*"?) optionalWhitespace? OptionalArgument? optionalWhitespace? OptionalArgument? optionalWhitespace? RefArgument
+    }
     )+
 }