diff -r e2519b3dd5e7 -r 93e0e89496fe src/chess/queen.h
--- a/src/chess/queen.h	Tue Sep 08 13:55:48 2026 +0200
+++ b/src/chess/queen.h	Tue Sep 08 14:34:48 2026 +0200
@@ -28,11 +28,11 @@
  */
 
 #ifndef QUEEN_H
-#define	QUEEN_H
+#define QUEEN_H
 
 #include "rules.h"
 
-#ifdef	__cplusplus
+#ifdef  __cplusplus
 extern "C" {
 #endif
 
@@ -45,9 +45,9 @@
 #define queen_moves_allowed(gamestate, color, file, rank, moves) \
         filter_moves_allowed(gamestate, color, file, rank, moves, queen_moves)
 
-#ifdef	__cplusplus
+#ifdef  __cplusplus
 }
 #endif
 
-#endif	/* QUEEN_H */
+#endif  /* QUEEN_H */