diff --git a/lib/args.js b/lib/args.js
index 35089f77..cf47b2ed 100644
--- a/lib/args.js
+++ b/lib/args.js
@@ -24,7 +24,10 @@ module.exports = function (proto) {
   }
 
   // http://www.graphicsmagick.org/GraphicsMagick.html#details-adjoin
-  proto.adjoin = function adjoin () {
+  proto.adjoin = function adjoin (numbered) {
+    if (numbered) {
+      return this.out("+adjoin");
+    }
     return this.out("-adjoin");
   }