diff --git a/src/common/capwap_network.c b/src/common/capwap_network.c
index a7c3132..616d4ce 100644
--- a/src/common/capwap_network.c
+++ b/src/common/capwap_network.c
@@ -1300,7 +1300,7 @@ void capwap_interface_list(struct capwap_network* net, struct capwap_list* list)
 
 
 /* */
-char* capwap_printf_macaddress(char* buffer, unsigned char* macaddress, int type) {
+char* capwap_printf_macaddress(char* buffer, const unsigned char* macaddress, int type) {
 	if (type == MACADDRESS_EUI48_LENGTH) {
 		sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x", macaddress[0], macaddress[1], macaddress[2], macaddress[3], macaddress[4], macaddress[5]);
 	} else if (type == MACADDRESS_EUI64_LENGTH) {
diff --git a/src/common/capwap_network.h b/src/common/capwap_network.h
index e5fee6f..69f0041 100644
--- a/src/common/capwap_network.h
+++ b/src/common/capwap_network.h
@@ -95,7 +95,7 @@ int capwap_address_from_string(const char* ip, struct sockaddr_storage* address)
 
 int capwap_get_localaddress_by_remoteaddress(struct sockaddr_storage* local, struct sockaddr_storage* remote, char* oif, int ipv6dualstack);
 
-char* capwap_printf_macaddress(char* buffer, unsigned char* macaddress, int type);
+char* capwap_printf_macaddress(char* buffer, const unsigned char* macaddress, int type);
 int capwap_scanf_macaddress(unsigned char* macaddress, const char* buffer, int type);
 
 #endif /* __CAPWAP_NETWORK_HEADER__ */