diff --git a/src/search.cpp b/src/search.cpp
index c59085dd..bb0994cf 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -489,7 +489,7 @@ Value Worker::search(
     }
 
     if (!PV_NODE && !is_in_check && depth <= tuned::rfp_depth && !excluded
-        && tt_adjusted_eval >= beta + tuned::rfp_margin * depth) {
+        && tt_adjusted_eval >= beta + tuned::rfp_margin * (depth - improving)) {
         return tt_adjusted_eval;
     }