diff --git a/autoload/emmet/lang/css.vim b/autoload/emmet/lang/css.vim
index ea04fb7..5cf0f9b 100644
--- a/autoload/emmet/lang/css.vim
+++ b/autoload/emmet/lang/css.vim
@@ -165,7 +165,8 @@ function! emmet#lang#css#imageSize()
     return
   endif
   let content = emmet#util#getContent(img_region)
-  let fn = matchstr(content, '\<url([''"]\zs[^''"]\+\ze[''"]')
+  let fn = matchstr(content, '\<url(\zs[^)]\+\ze)')
+  let fn = substitute(fn, '[''" \t]', '', 'g')
   if fn =~ '^\s*$'
     return
   elseif fn !~ '^\(/\|http\)'