diff --git a/runtime/themes/catppuccin_mocha.toml b/runtime/themes/catppuccin_mocha.toml
index c8138fc44..1f88e7e99 100644
--- a/runtime/themes/catppuccin_mocha.toml
+++ b/runtime/themes/catppuccin_mocha.toml
@@ -115,6 +115,7 @@
 "ui.menu" = { fg = "overlay2", bg = "surface0" }
 "ui.menu.selected" = { fg = "text", bg = "surface1", modifiers = ["bold"] }
 
+"diagnostic.unnecessary" = { modifiers = ["dim"] }
 "diagnostic.error" = { underline = { color = "red", style = "curl" } }
 "diagnostic.warning" = { underline = { color = "yellow", style = "curl" } }
 "diagnostic.info" = { underline = { color = "sky", style = "curl" } }