diff --git a/ext/drampower/src/CmdScheduler.h b/ext/drampower/src/CmdScheduler.h
index 58efd279b1..1497304f54 100644
--- a/ext/drampower/src/CmdScheduler.h
+++ b/ext/drampower/src/CmdScheduler.h
@@ -84,8 +84,7 @@ class cmdScheduler {
     std::string  name;
     physicalAddr PhysicalAddr;
     // sorting the commands according to their scheduling time.
-    struct commandItemSorter : public std::binary_function<commandItem&,
-                                                           commandItem&, bool>{
+    struct commandItemSorter {
       bool operator()(const commandItem& lhs,
                       const commandItem& rhs) const
       {