diff --git a/runtime/queries/objectscript_routine/highlights.scm b/runtime/queries/objectscript_routine/highlights.scm
index cbec0cf19..2e8b5ff92 100644
--- a/runtime/queries/objectscript_routine/highlights.scm
+++ b/runtime/queries/objectscript_routine/highlights.scm
@@ -117,6 +117,7 @@
   "'?"
   "!"
   "?"
+  "--"
 ] @operator
 
 (bracket) @punctuation.bracket
diff --git a/runtime/queries/objectscript_udl/highlights.scm b/runtime/queries/objectscript_udl/highlights.scm
index 2287c0042..a7539a13f 100644
--- a/runtime/queries/objectscript_udl/highlights.scm
+++ b/runtime/queries/objectscript_udl/highlights.scm
@@ -113,6 +113,7 @@
   "'?"
   "!"
   "?"
+  "--"
 ] @operator
 
 (bracket) @punctuation.bracket