diff --git a/src/nnue/features/full_threats.cpp b/src/nnue/features/full_threats.cpp
index baa444843..03ad158e6 100644
--- a/src/nnue/features/full_threats.cpp
+++ b/src/nnue/features/full_threats.cpp
@@ -212,7 +212,7 @@ void FullThreats::append_active_indices(Color perspective, const Position& pos,
 
     for (Color color : {WHITE, BLACK})
     {
-        for (PieceType pt = PAWN; pt <= KING; ++pt)
+        for (PieceType pt = PAWN; pt < KING; ++pt)
         {
             Color    c        = Color(perspective ^ color);
             Piece    attacker = make_piece(c, pt);