diff --git a/syntax/javascript.nanorc b/syntax/javascript.nanorc
index 9adbe0d0..10925477 100644
--- a/syntax/javascript.nanorc
+++ b/syntax/javascript.nanorc
@@ -12,7 +12,7 @@ color brightyellow "\<(await|export|import|throw|try|catch|finally|new|delete)\>
 color magenta "\<(break|continue|return|yield)\>"
 
 # Octal/decimal and hexadecimal numbers.
-color cyan "\<[0-9]+\>" "\<0x[0-9A-Fa-f]+\>"
+color cyan "\<([0-9]+|0x[0-9A-Fa-f]+)\>"
 # Special values.
 color cyan "\<(true|false|null|undefined)\>"