diff --git a/rc/core/c-family.kak b/rc/core/c-family.kak
index 96c56ac9..2e4608e4 100644
--- a/rc/core/c-family.kak
+++ b/rc/core/c-family.kak
@@ -154,7 +154,7 @@ evaluate-commands %sh{
 }
 
 # c specific
-add-highlighter shared/c/code/numbers regex %{\b-?(0x[0-9a-fA-F]+|\d+)([fdiuUlL]+)?|'((\\.)?|[^'\\])'} 0:value
+add-highlighter shared/c/code/numbers regex %{\b-?(0x[0-9a-fA-F]+|\d+)([fFdDiIuUlL]+)?|'((\\.)?|[^'\\])'} 0:value
 evaluate-commands %sh{
     # Grammar
     keywords="asm break case continue default do else for goto if return