diff --git a/runtime/queries/rust/highlights.scm b/runtime/queries/rust/highlights.scm
index 78a7abf0..7d0afcde 100644
--- a/runtime/queries/rust/highlights.scm
+++ b/runtime/queries/rust/highlights.scm
@@ -183,7 +183,7 @@
 ; -------
 
 ((identifier) @constant
- (#match? @constant "^[A-Z][A-Z\\d_]+$"))
+ (#match? @constant "^[A-Z][A-Z\\d_]*$"))
 
 ; ---
 ; PascalCase identifiers in call_expressions (e.g. `Ok()`)