diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..70a271d
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,4 @@
+**/*
+
+!src/
+!pkg/
\ No newline at end of file
diff --git a/package.json b/package.json
index 7ec8f77..8a3ea02 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,8 @@
   },
   "scripts": {
     "build": "pack build",
-    "test": "testee test/connect.html test/disconnect.html test/change.html --browsers firefox"
+    "test": "testee test/connect.html test/disconnect.html test/change.html --browsers firefox",
+    "prepare": "npm run build"
   },
   "repository": {
     "type": "git",
diff --git a/src/registry.js b/src/registry.js
index cb23605..46b1845 100644
--- a/src/registry.js
+++ b/src/registry.js
@@ -117,8 +117,7 @@ class CustomAttributeRegistry {
       }
     }
     // Attribute was removed
-    else if(newVal == null && !!inst.value) {
-      inst.value = newVal;
+    else if(newVal == null) {
       if(inst.disconnectedCallback) {
         inst.disconnectedCallback();
       }