diff --git a/src/pawns.h b/src/pawns.h
index 673bcfa5..4b61d80e 100644
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -58,9 +58,9 @@ private:
 
   Key key;
   Bitboard passedPawns;
-  int mgValue, egValue;
-  int ksStormValue[2], qsStormValue[2];
-  int halfOpenFiles[2];
+  int16_t mgValue, egValue;
+  int16_t ksStormValue[2], qsStormValue[2];
+  uint8_t halfOpenFiles[2];
 };