diff --git a/Samples/Common/include/Sample.h b/Samples/Common/include/Sample.h
index 6064d8f..e6851a4 100644
--- a/Samples/Common/include/Sample.h
+++ b/Samples/Common/include/Sample.h
@@ -63,7 +63,7 @@ namespace OgreBites
 		=============================================================================*/
 		struct Comparer
 		{
-			bool operator() (Sample* a, Sample* b)
+			bool operator() (Sample* a, Sample* b) const
 			{
 				Ogre::NameValuePairList::iterator aTitle = a->getInfo().find("Title");
 				Ogre::NameValuePairList::iterator bTitle = b->getInfo().find("Title");