diff --git a/lib/utils.js b/lib/utils.js
index 5ddb81b95..41178796c 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -98,7 +98,7 @@ function can_add_tag(tag, config) {
 }
 
 module.exports.tag_version = function(data, version, tag, config) {
-	if (!can_add_tag(tag, config)) return
+	if (!can_add_tag(tag, config)) return false
 
 	switch(typeof(data['dist-tags'][tag])) {
 		case 'string':
@@ -112,7 +112,9 @@ module.exports.tag_version = function(data, version, tag, config) {
 	if (data['dist-tags'][tag].indexOf(version) === -1) {
 		data['dist-tags'][tag].push(version)
 		data['dist-tags'][tag] = module.exports.semver_sort(data['dist-tags'][tag])
+		return data['dist-tags'][tag][data['dist-tags'][tag].length - 1] === version
 	}
+	return false
 }
 
 // gets version from a package object taking into account semver weirdness
diff --git a/test/unit/tag_version.js b/test/unit/tag_version.js
new file mode 100644
index 000000000..9e3b8075e
--- /dev/null
+++ b/test/unit/tag_version.js
@@ -0,0 +1,55 @@
+var assert = require('assert')
+  , tag_version = require('../../lib/utils').tag_version
+
+require('../../lib/logger').setup([])
+
+describe('tag_version', function() {
+	it('add new one', function() {
+		var x = {
+			versions: {},
+			'dist-tags': {},
+		}
+		assert(tag_version(x, '1.1.1', 'foo', {}))
+		assert.deepEqual(x, {
+			versions: {},
+			'dist-tags': {foo: ['1.1.1']},
+		})
+	})
+
+	it('add (compat)', function() {
+		var x = {
+			versions: {},
+			'dist-tags': {foo: '1.1.0'},
+		}
+		assert(tag_version(x, '1.1.1', 'foo', {}))
+		assert.deepEqual(x, {
+			versions: {},
+			'dist-tags': {foo: ['1.1.0', '1.1.1']},
+		})
+	})
+
+	it('add fresh tag', function() {
+		var x = {
+			versions: {},
+			'dist-tags': {foo: ['1.1.0']},
+		}
+		assert(tag_version(x, '1.1.1', 'foo', {}))
+		assert.deepEqual(x, {
+			versions: {},
+			'dist-tags': {foo: ['1.1.0', '1.1.1']},
+		})
+	})
+
+	it('add stale tag', function() {
+		var x = {
+			versions: {},
+			'dist-tags': {foo: ['1.1.2']},
+		}
+		assert(!tag_version(x, '1.1.1', 'foo', {}))
+		assert.deepEqual(x, {
+			versions: {},
+			'dist-tags': {foo: ['1.1.1', '1.1.2']},
+		})
+	})
+})
+