diff --git a/signs.h b/signs.h
--- a/signs.h
+++ b/signs.h
@@ -11,7 +11,7 @@ typedef struct SignStruct {
 	int32        x;
 	int32        y;
 	byte         z;
-	byte owner; // placed by this player. Anyone can delete them though.
+	PlayerID owner; // placed by this player. Anyone can delete them though.
 							// OWNER_NONE for gray signs from old games.
 
 	uint16       index;