diff --git a/src/search.cpp b/src/search.cpp
index 13fb4b30..4a0302e5 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -921,7 +921,8 @@ moves_loop: // When in check search starts from here
               continue;
 
           // History based pruning
-          if (   depth <= 3 * ONE_PLY
+          if (   depth <= 4 * ONE_PLY
+              && move != ss->killers[0]
               && thisThread->history[pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO
               && cmh[pos.moved_piece(move)][to_sq(move)] < VALUE_ZERO)
               continue;