diff --git a/lib/SimuGaz/simugaz.h b/lib/SimuGaz/simugaz.h
index d0df98d..c183478 100644
--- a/lib/SimuGaz/simugaz.h
+++ b/lib/SimuGaz/simugaz.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <Arduino.h>
 
 uint32_t simulateGasPulses(uint32_t intervalSeconds = 86400);
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