diff --git a/after/syntax/css/color-4.vim b/after/syntax/css/color-4.vim
index 7ebb950..19ecebd 100644
--- a/after/syntax/css/color-4.vim
+++ b/after/syntax/css/color-4.vim
@@ -1,3 +1,3 @@
 syn match cssColorProp contained "\<color-adjust\>"
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(hwb\|lab\|lch\|gray\|color\|device-cmyk\|color-mod\=\)\s*(" end=")" oneline keepend
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(hwb\|lab\|lch\|gray\|color\|device-cmyk\=\)\s*(" end=")" oneline keepend
 syn match cssFontDescriptor "@color-profile\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl
diff --git a/test/test.css b/test/test.css
index a370d35..aa879a7 100644
--- a/test/test.css
+++ b/test/test.css
@@ -95,7 +95,6 @@
   display: gray(50%);
   display: color(swopc, 0 206 190 77);
   display: device-cmyk(0, 81%, 81%, 30%);
-  display: color-mod(#112233 tint(50%));
 }
 
 @color-profile swopc {