diff --git a/lib/redis/namespace.rb b/lib/redis/namespace.rb
index fa3b34d..f06f2f6 100644
--- a/lib/redis/namespace.rb
+++ b/lib/redis/namespace.rb
@@ -36,7 +36,7 @@ class Namespace
     #       MSET key1 value1 key2 value2 =>
     #       MSET namespace:key1 value1 namespace:key2 value2
     #   :sort
-    #     Add namespace to first argument if it is non-nil
+    #     Add namespace to first argument
     #     Add namespace to second arg's :by and :store if second arg is a Hash
     #     Add namespace to each element in second arg's :get if second arg is
     #       a Hash; forces second arg's :get to be an Array if present.
@@ -366,7 +366,7 @@ def call_with_namespace(command, *args, &block)
       # Add the namespace to any parameters that are keys.
       case before
       when :first
-        args[0] = add_namespace(args[0]) if args[0]
+        args[0] = add_namespace(args[0])
       when :all
         args = add_namespace(args)
       when :exclude_first
@@ -388,7 +388,7 @@ def call_with_namespace(command, *args, &block)
       when :alternate
         args.each_with_index { |a, i| args[i] = add_namespace(a) if i.even? }
       when :sort
-        args[0] = add_namespace(args[0]) if args[0]
+        args[0] = add_namespace(args[0])
         if args[1].is_a?(Hash)
           [:by, :store].each do |key|
             args[1][key] = add_namespace(args[1][key]) if args[1][key]
@@ -464,7 +464,7 @@ def namespaced_block(command, &block)
     end
 
     def add_namespace(key)
-      return key unless key && @namespace
+      return key unless @namespace
 
       case key
       when Array
diff --git a/spec/redis_spec.rb b/spec/redis_spec.rb
index 885b4dc..647a37e 100644
--- a/spec/redis_spec.rb
+++ b/spec/redis_spec.rb
@@ -32,6 +32,7 @@
     @namespaced['foo'].should eq(nil)
     @namespaced['foo'] = 'chris'
     @namespaced['foo'].should eq('chris')
+    @redis['foo'].should eq('bar')
     @redis['foo'] = 'bob'
     @redis['foo'].should eq('bob')
 
@@ -41,6 +42,17 @@
     @namespaced.type('counter').should eq('string')
   end
 
+  context 'when key is nil' do
+    it 'should still be able to use a namespace' do
+      @namespaced[nil].should eq(nil)
+      @namespaced[nil] = 'chris'
+      @namespaced[nil].should eq('chris')
+      @redis[nil].should eq(nil)
+      @redis[nil] = 'bob'
+      @redis[nil].should eq('bob')
+    end
+  end
+
   context 'when sending capital commands (issue 68)' do
     it 'should be able to use a namespace' do
       @namespaced.send('SET', 'fubar', 'quux')