diff --git a/lib/processor.js b/lib/processor.js
index 50e37f8..91d5a6e 100644
--- a/lib/processor.js
+++ b/lib/processor.js
@@ -1,14 +1,34 @@
 let parser = require('postcss-value-parser')
 
 let Value = require('./value')
+let vendor = require('./vendor')
 let insertAreas = require('./hacks/grid-utils').insertAreas
 
 const OLD_LINEAR = /(^|[^-])linear-gradient\(\s*(top|left|right|bottom)/i
 const OLD_RADIAL = /(^|[^-])radial-gradient\(\s*\d+(\w*|%)\s+\d+(\w*|%)\s*,/i
 const IGNORE_NEXT = /(!\s*)?autoprefixer:\s*ignore\s+next(?!\s+warning)/i
 const IGNORE_NEXT_WARNING = /(!\s*)?autoprefixer:\s*ignore\s+next\s+warning/i
+const PREFIXED_VALUE = /(^|[\s,(])-\w+-/
 const GRID_REGEX = /(!\s*)?autoprefixer\s*grid:\s*(on|off|(no-)?autoplace)/i
 
+/**
+ * Is the node right after an `ignore next warning` control comment?
+ * Prefixed copies inserted before the node are skipped on the way back.
+ */
+function hasIgnoreWarningComment(node) {
+  let prev = node.prev()
+  while (
+    prev &&
+    prev.type === 'decl' &&
+    (vendor.prefix(prev.prop) || PREFIXED_VALUE.test(prev.value))
+  ) {
+    prev = prev.prev()
+  }
+  return (
+    !!prev && prev.type === 'comment' && IGNORE_NEXT_WARNING.test(prev.text)
+  )
+}
+
 const SIZES = [
   'width',
   'height',
@@ -56,13 +76,6 @@ class Processor {
    * Add necessary prefixes
    */
   add(css, result) {
-    // Mark nodes before prefixes are inserted between them and comments
-    css.walkComments(comment => {
-      if (IGNORE_NEXT_WARNING.test(comment.text) && comment.next()) {
-        comment.next()._autoprefixerIgnoreWarning = true
-      }
-    })
-
     // At-rules
     let resolution = this.prefixes.add['@resolution']
     let keyframes = this.prefixes.add['@keyframes']
@@ -393,7 +406,7 @@ class Processor {
         i.type === 'warning' &&
         i.plugin === 'autoprefixer' &&
         i.node &&
-        i.node._autoprefixerIgnoreWarning
+        hasIgnoreWarningComment(i.node)
       )
     })
   }