diff --git a/services/web/frontend/js/features/source-editor/lezer-bibtex/bibtex.grammar b/services/web/frontend/js/features/source-editor/lezer-bibtex/bibtex.grammar
index eb3ac4b593..1fa519d4bc 100644
--- a/services/web/frontend/js/features/source-editor/lezer-bibtex/bibtex.grammar
+++ b/services/web/frontend/js/features/source-editor/lezer-bibtex/bibtex.grammar
@@ -5,7 +5,7 @@
 @tokens {
   Other { ![@ \t\n] ![@]* }
   whiteSpace { $[\t\n ]+ }
-  Identifier { $[a-zA-Z:_0-9-/]+ }
+  Identifier { ![,{} \t\n%]+ }
   StringName { $[a-zA-Z:_] $[a-zA-Z:_0-9-]* }
   FieldName {$[a-zA-Z-_0-9]+}
   LiteralString {