diff --git a/src/etc/gedit/share/gtksourceview-3.0/language-specs/rust.lang b/src/etc/gedit/share/gtksourceview-3.0/language-specs/rust.lang
index 9f22a99b7741f..373e9f78cc295 100644
--- a/src/etc/gedit/share/gtksourceview-3.0/language-specs/rust.lang
+++ b/src/etc/gedit/share/gtksourceview-3.0/language-specs/rust.lang
@@ -270,6 +270,7 @@
       '|"|
       \\|n|r|t|0|
       x\%{hex_digit}{2}|
+      u{\%{hex_digit}{1,6}}|
       u\%{hex_digit}{4}|
       U\%{hex_digit}{8}
     </define-regex>