diff --git a/src/search.cpp b/src/search.cpp
index a35aad45..9af7a115 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1097,12 +1097,9 @@ moves_loop:  // When in check, search starts here
                     int doubleMargin = 249 * PvNode - 194 * !ttCapture - corrValAdj;
                     int tripleMargin =
                       94 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
-                    int quadMargin =
-                      394 + 287 * PvNode - 249 * !ttCapture + 99 * ss->ttPv - corrValAdj;
 
                     extension = 1 + (value < singularBeta - doubleMargin)
-                              + (value < singularBeta - tripleMargin)
-                              + (value < singularBeta - quadMargin);
+                              + (value < singularBeta - tripleMargin);
 
                     depth += ((!PvNode) && (depth < 15));
                 }