diff --git a/BE-chti C/soft/PjtKEIL_StepSon/Src/GestionSon.h b/BE-chti C/soft/PjtKEIL_StepSon/Src/GestionSon.h
index 69d9614..d6e4710 100644
--- a/BE-chti C/soft/PjtKEIL_StepSon/Src/GestionSon.h	
+++ b/BE-chti C/soft/PjtKEIL_StepSon/Src/GestionSon.h	
@@ -1,2 +1,7 @@
+#ifndef GESTION_SON
+#define GESTION_SON
+
 void StartSon(void);
-void GestionSon(void);
\ No newline at end of file
+void GestionSon(void);
+
+#endif
\ No newline at end of file