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 fd4f970d06..2d67081ea2 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
@@ -4,7 +4,7 @@
 
 @tokens {
   whiteSpace { @whitespace+ }
-  Identifier { $[a-zA-Z:_0-9-]+ }
+  Identifier { $[a-zA-Z:_0-9-/]+ }
   StringName { $[a-zA-Z:_] $[a-zA-Z:_0-9-]* }
   FieldName {$[a-zA-Z-_0-9]+}
   LiteralString {