diff --git a/include/controlBus.h b/include/controlBus.h
index 6619e6e..3dc8b11 100644
--- a/include/controlBus.h
+++ b/include/controlBus.h
@@ -170,7 +170,7 @@ uint8_t epi_getResultOfLastRequest();
     // retval: 0: in progress  1: OK  2: error
 
 
-void gpi_storeRecPayLoad(uint8_t RdDlen, uint8_t *receivedData);
+void gpi_storeRecPayLoad(uint8_t RdDlen, uint8_t const *receivedData);
     // stored by Datif
 
 uint16_t epi_getLastPayLoad(uint16_t plBufSiz, uint8_t *payLoad);