diff --git a/src/material.cpp b/src/material.cpp
index 27ea5923..dc5003dd 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -36,10 +36,6 @@ using namespace std;
 
 namespace {
 
-  // Values modified by Joona Kiiski
-  const Value BishopPairMidgameBonus = Value(109);
-  const Value BishopPairEndgameBonus = Value(97);
-
   // Polynomial material balance parameters
   const Value RedundantQueenPenalty = Value(320);
   const Value RedundantRookPenalty  = Value(554);