Index: node_modules/autoprefixer/lib/hacks/flex-wrap.js
===================================================================
--- node_modules/autoprefixer/lib/hacks/flex-wrap.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
+++ node_modules/autoprefixer/lib/hacks/flex-wrap.js	(revision 2058e5c694bb6097866a5fe6503c519e8f74970f)
@@ -0,0 +1,19 @@
+let Declaration = require('../declaration')
+let flexSpec = require('./flex-spec')
+
+class FlexWrap extends Declaration {
+  /**
+   * Don't add prefix for 2009 spec
+   */
+  set(decl, prefix) {
+    let spec = flexSpec(prefix)[0]
+    if (spec !== 2009) {
+      return super.set(decl, prefix)
+    }
+    return undefined
+  }
+}
+
+FlexWrap.names = ['flex-wrap']
+
+module.exports = FlexWrap