--- a/include/beecrypt/c++/util/AbstractSet.h
+++ b/include/beecrypt/c++/util/AbstractSet.h
@@ -56,7 +56,7 @@
 					if (c->size() != size())
 						return false;
 
-					return containsAll(*c);
+					return this->containsAll(*c);
 				}
 				return false;
 			}