diff --git a/src/nnue/features/castling_right.cpp b/src/nnue/features/castling_right.cpp
index 47fbd986..86fe06fe 100644
--- a/src/nnue/features/castling_right.cpp
+++ b/src/nnue/features/castling_right.cpp
@@ -26,7 +26,7 @@ namespace Eval {
             & ((castling_rights >> 2) & 3);
         }
 
-        for (int i = 0; i <kDimensions; ++i) {
+        for (Eval::NNUE::IndexType i = 0; i < kDimensions; ++i) {
           if (relative_castling_rights & (i << 1)) {
             active->push_back(i);
           }
@@ -36,7 +36,7 @@ namespace Eval {
       // Get a list of indices whose values ​​have changed from the previous one in the feature quantity
       void CastlingRight::AppendChangedIndices(
         const Position& pos, Color perspective,
-        IndexList* removed, IndexList* added) {
+        IndexList* removed, IndexList* /* added */) {
 
         int previous_castling_rights = pos.state()->previous->castlingRights;
         int current_castling_rights = pos.state()->castlingRights;
@@ -54,7 +54,7 @@ namespace Eval {
             & ((current_castling_rights >> 2) & 3);
         }
 
-        for (int i = 0; i < kDimensions; ++i) {
+        for (Eval::NNUE::IndexType i = 0; i < kDimensions; ++i) {
           if ((relative_previous_castling_rights & (i << 1)) &&
             (relative_current_castling_rights & (i << 1)) == 0) {
             removed->push_back(i);
diff --git a/src/nnue/features/enpassant.cpp b/src/nnue/features/enpassant.cpp
index 77bc936e..386bd907 100644
--- a/src/nnue/features/enpassant.cpp
+++ b/src/nnue/features/enpassant.cpp
@@ -30,8 +30,8 @@ namespace Eval {
 
       // Get a list of indices whose values ??have changed from the previous one in the feature quantity
       void EnPassant::AppendChangedIndices(
-        const Position& pos, Color perspective,
-        IndexList* removed, IndexList* added) {
+        const Position& /* pos */, Color /* perspective */,
+        IndexList* /* removed */, IndexList* /* added */) {
         // Not implemented.
         assert(false);
       }