diff --git a/lib/bus.js b/lib/bus.js
index 277491c..40de03d 100644
--- a/lib/bus.js
+++ b/lib/bus.js
@@ -483,7 +483,7 @@ class MessageBus extends EventEmitter {
   }
 
   _addMatch (match) {
-    if (Object.prototype.hasOwnProperty.call(match, this._matchRules)) {
+    if (Object.prototype.hasOwnProperty.call(this._matchRules, match)) {
       this._matchRules[match] += 1;
       return Promise.resolve();
     }
@@ -507,7 +507,7 @@ class MessageBus extends EventEmitter {
       return Promise.resolve();
     }
 
-    if (Object.prototype.hasOwnProperty.call(match, this._matchRules)) {
+    if (Object.prototype.hasOwnProperty.call(this._matchRules, match)) {
       this._matchRules[match] -= 1;
       if (this._matchRules[match] > 0) {
         return Promise.resolve();
diff --git a/package.json b/package.json
index cc589ba..4287c23 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "long": "^4.0.0",
     "@nornagon/put": "0.0.8",
     "safe-buffer": "^5.1.1",
-    "xml2js": "^0.4.17"
+    "xml2js": "^0.6.2"
   },
   "optionalDependencies": {
     "usocket": "^1.0.1"