diff --git a/lib/stream/multi.rb b/lib/stream/multi.rb
index c43d11023..c1ecd599d 100644
--- a/lib/stream/multi.rb
+++ b/lib/stream/multi.rb
@@ -49,7 +49,7 @@ class Stream::Multi < Stream::Base
 
   # @return [Symbol]
   def is_in?(sym, post)
-    if self.send("#{sym.to_s}_post_ids").find{|x| x == post.id}
+    if self.send("#{sym.to_s}_post_ids").find{|x| x.to_s == post.id.to_s}
       "#{sym.to_s}_stream".to_sym
     end
   end
diff --git a/spec/lib/stream/multi_spec.rb b/spec/lib/stream/multi_spec.rb
index b5bbcb9d5..21a81d4eb 100644
--- a/spec/lib/stream/multi_spec.rb
+++ b/spec/lib/stream/multi_spec.rb
@@ -6,7 +6,16 @@ describe Stream::Multi do
     @stream = Stream::Multi.new(Factory(:user), :max_time => Time.now, :order => 'updated_at')
   end
 
+
   describe 'shared behaviors' do
     it_should_behave_like 'it is a stream'
   end
+
+  describe '#is_in?' do
+    it 'handles when the cache returns strings' do
+      p = Factory(:status_message)
+      @stream.should_receive(:aspects_post_ids).and_return([p.id.to_s])
+      @stream.send(:is_in?, :aspects, p).should be_true
+    end
+  end
 end