diff --git a/lib/jsdoc/tag/dictionary.js b/lib/jsdoc/tag/dictionary.js
index c10f8f22..18190502 100644
--- a/lib/jsdoc/tag/dictionary.js
+++ b/lib/jsdoc/tag/dictionary.js
@@ -57,8 +57,11 @@ dictionary = {
     
     /** @function */
     isNamespace: function(kind) {
-        if ( _namespaces.indexOf(kind) !== -1) {
-            return true;
+        if (kind) {
+            kind = dictionary.normalise(kind);
+            if ( _namespaces.indexOf(kind) !== -1) {
+                return true;
+            }
         }
         
         return false;
diff --git a/test/specs/jsdoc/tag/dictionary.js b/test/specs/jsdoc/tag/dictionary.js
index dfa37525..6c0768b9 100644
--- a/test/specs/jsdoc/tag/dictionary.js
+++ b/test/specs/jsdoc/tag/dictionary.js
@@ -71,12 +71,11 @@ describe('jsdoc/tag/dictionary', function() {
     });
 
     describe("isNamespace", function() {
-        // TODO: BUG: isNamespace should use a normalised title.
-        xit("returns whether a tag is a namespace when using its canonical name", function() {
+        it("returns whether a tag is a namespace when using its canonical name", function() {
             expect(dictionary.isNamespace(tagTitle)).toEqual(true);
         });
 
-        xit("returns whether a tag is a namespace when using its synonym", function() {
+        it("returns whether a tag is a namespace when using its synonym", function() {
             expect(dictionary.isNamespace(tagSynonym)).toEqual(true);
         });