diff --git a/Firmware/Hub-Mega2560/Hub-Mega2560.ino b/Firmware/Hub-Mega2560/Hub-Mega2560.ino
index a156778..54cc2ec 100644
--- a/Firmware/Hub-Mega2560/Hub-Mega2560.ino
+++ b/Firmware/Hub-Mega2560/Hub-Mega2560.ino
@@ -170,7 +170,7 @@ typedef struct packet {
 packet_t* packetHead = NULL;
 unsigned char packetID = 0;
 
-void pushPacket(unsigned char cmd, signed char slot) {
+void pushPacket(unsigned char cmd, unsigned char slot) {
     // Create new packet
     packet_t* packet = malloc(sizeof(packet_t));
     packet->next = NULL;
@@ -202,7 +202,7 @@ void pushPacket(unsigned char cmd, signed char slot) {
 #endif
 }
 
-packet_t *getPacket(unsigned char cmd, signed char slot) {
+packet_t *getPacket(unsigned char cmd, unsigned char slot) {
     // Find packet with matching cmd/slot
     packet_t *packet = packetHead;
     while (packet) {