diff --git a/src/storeINdata.cpp b/src/storeINdata.cpp
index 0f70597..0c14c94 100644
--- a/src/storeINdata.cpp
+++ b/src/storeINdata.cpp
@@ -954,7 +954,7 @@ uint8_t epi_restoreMifData(uint8_t blkNr, uint8_t *buf, uint8_t maxBufferSize) {
     return 0;   // ois OK
 }
 
-void gpi_storeNewMifareCard(uint8_t typ, uint8_t *holder) {
+void gpi_storeNewMifareCard(uint8_t typ, uint8_t const *holder) {
     SharedMemBuffer::getData()->mif_cardType = typ;
     strncpy((char *)holder, (char *)SharedMemBuffer::getData()->mif_cardHolder, 7);
     SharedMemBuffer::getData()->mif_cardHolder[7] = '\0';