diff --git a/src/wireless_communication_status_screen.c b/src/wireless_communication_status_screen.c
index dc60f591d8..3ce8664795 100644
--- a/src/wireless_communication_status_screen.c
+++ b/src/wireless_communication_status_screen.c
@@ -32,7 +32,7 @@ enum {
 #define GROUPTYPE_BATTLE  1
 #define GROUPTYPE_UNION   2
 #define GROUPTYPE_TOTAL   3
-#define GROUPTYPE_NONE   -1
+#define GROUPTYPE_NONE    0xFF
 #define NUM_GROUPTYPES    4
 
 struct WirelessCommunicationStatusScreen
@@ -382,7 +382,7 @@ static u32 CountPlayersInGroupAndGetActivity(struct RfuPlayer * player, u32 * gr
     for (i = 0; i < ARRAY_COUNT(sActivityGroupInfo); i++)
     {
 #ifdef UBFIX
-        // GROUPTYPE_NONE is -1, and shouldn't be used as an index into groupCounts.
+        // GROUPTYPE_NONE is 0xFF, and shouldn't be used as an index into groupCounts.
         // In theory the only activity with this group type (ACTIVITY_SEARCH) wouldn't
         // satisfy the condition below, but not necessarily.
         if (group_type(i) == GROUPTYPE_NONE)