diff --git a/src/search.cpp b/src/search.cpp
index aa78a673f..446f81379 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -322,7 +322,7 @@ void Search::Worker::iterative_deepening() {
             selDepth = 0;
 
             // Reset aspiration window starting size
-            delta     = 5 + std::abs(rootMoves[pvIdx].meanSquaredScore) / 11131;
+            delta     = 5 + threadIdx % 8 + std::abs(rootMoves[pvIdx].meanSquaredScore) / 11131;
             Value avg = rootMoves[pvIdx].averageScore;
             alpha     = std::max(avg - delta, -VALUE_INFINITE);
             beta      = std::min(avg + delta, VALUE_INFINITE);