diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 4bd9f71c..f93bdbc3 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -356,7 +356,7 @@ Bro:
 
 C:
   type: programming
-  color: "#555"
+  color: "#555555"
   extensions:
   - .c
   - .cats