diff --git a/rc/core/c-family.kak b/rc/core/c-family.kak
index 4bc01475..71eb94a9 100644
--- a/rc/core/c-family.kak
+++ b/rc/core/c-family.kak
@@ -155,7 +155,7 @@ evaluate-commands %sh{
 }
 
 # c specific
-add-highlighter shared/c/code/numbers regex %{\b-?(0x[0-9a-fA-F]+|\d+)[fdiu]?|'((\\.)?|[^'\\])'} 0:value
+add-highlighter shared/c/code/numbers regex %{\b-?(0x[0-9a-fA-F]+|\d+)([uU][lL]{0,2}|[lL]{1,2}[uU]?|[fFdDiI])?|'((\\.)?|[^'\\])'} 0:value
 evaluate-commands %sh{
     # Grammar
     keywords="asm break case continue default do else for goto if return