diff --git a/src/search.cpp b/src/search.cpp
index 6e719be8..3cd3b555 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -772,7 +772,7 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
                 update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
                                               stat_bonus(depth) * bonus);
                 thisThread->mainHistory[~us][from_to((ss - 1)->currentMove)]
-                  << stat_bonus(depth) * bonus * 57 / 100;
+                  << stat_bonus(depth) * bonus / 2;
             }
             return value;
         }
@@ -1339,7 +1339,7 @@ moves_loop:  // When in check, search starts here
         update_continuation_histories(ss - 1, pos.piece_on(prevSq), prevSq,
                                       stat_bonus(depth) * bonus);
         thisThread->mainHistory[~us][from_to((ss - 1)->currentMove)]
-          << stat_bonus(depth) * bonus * 61 / 100;
+          << stat_bonus(depth) * bonus / 2;
     }
 
     if (PvNode)