diff --git a/library/include/mobilisis/payment_method.h b/library/include/mobilisis/payment_method.h
index d6d1921..2132731 100644
--- a/library/include/mobilisis/payment_method.h
+++ b/library/include/mobilisis/payment_method.h
@@ -1,10 +1,12 @@
-#pragma once
-
-enum PaymentMethod
-{
-	Undefined = 0xFF,
-	Progressive = 0x01,
-	Degressive = 0x02,
-	Linear = 0x03,
-	Steps = 0x04
-};
\ No newline at end of file
+#ifndef PAYMENT_METHOD_H_INCLUDED
+#define PAYMENT_METHOD_H_INCLUDED
+
+enum PaymentMethod {
+	Undefined = 0xFF,
+	Progressive = 0x01,
+	Degressive = 0x02,
+	Linear = 0x03,
+	Steps = 0x04
+};
+
+#endif // PAYMENT_METHOD_H_INCLUDED