diff --git a/vim/syntax/html_custom.vim b/vim/syntax/html_custom.vim
index 0c022de..00ccf10 100644
--- a/vim/syntax/html_custom.vim
+++ b/vim/syntax/html_custom.vim
@@ -59,7 +59,7 @@ syn region htmlAltValue contained start=+"+hs=s+1 end=+"+he=s-1 contains=cssAttr
 syn match htmlAltArg "alt" contained
 
 " data-*
-syn region htmlArgRegion contained start=+data.*="+hs=s+5 end=+"+he=e-1 contains=htmlDataArg,htmlDataValue,cssAttrNoise keepend
+syn region htmlArgRegion contained start=+data.*="+hs=s+5 end=+"+ contains=htmlDataArg,htmlDataValue,cssAttrNoise keepend
 "syn region htmlArgRegion contained start=+alt='+hs=s+5 end=+'+he=e-1 contains=htmlSpecialChar,htmlAltArg,htmlAltValue,cssAttrNoise keepend
 syn region htmlDataValue contained start=+"+hs=s+1 end=+"+me=e-1 contains=cssAttrNoise keepend
 syn match htmlDataArg +data.*="+me=e-2 contained