diff --git a/src/ChatCommands.cc b/src/ChatCommands.cc
index 06321a9d..04919cef 100644
--- a/src/ChatCommands.cc
+++ b/src/ChatCommands.cc
@@ -309,10 +309,10 @@ static void server_command_qset_qclear(shared_ptr<Client> c, const std::string&
   }
 
   if (is_v1_or_v2(c->version())) {
-    G_SetQuestFlag_DC_PC_6x75 cmd = {{0x75, 0x02, 0x0000}, flag_num, should_set ? 0 : 1};
+    G_UpdateQuestFlag_DC_PC_6x75 cmd = {{0x75, 0x02, 0x0000}, flag_num, should_set ? 0 : 1};
     send_command_t(l, 0x60, 0x00, cmd);
   } else {
-    G_SetQuestFlag_V3_BB_6x75 cmd = {{{0x75, 0x03, 0x0000}, flag_num, should_set ? 0 : 1}, l->difficulty, 0x0000};
+    G_UpdateQuestFlag_V3_BB_6x75 cmd = {{{0x75, 0x03, 0x0000}, flag_num, should_set ? 0 : 1}, l->difficulty, 0x0000};
     send_command_t(l, 0x60, 0x00, cmd);
   }
 }
diff --git a/src/CommandFormats.hh b/src/CommandFormats.hh
index 762e8fe8..32792199 100644
--- a/src/CommandFormats.hh
+++ b/src/CommandFormats.hh
@@ -4781,16 +4781,15 @@ struct G_WordSelect_6x74 {
   WordSelectMessage message;
 } __packed__;
 
-// 6x75: Set quest flag
+// 6x75: Update quest flag
 
-struct G_SetQuestFlag_DC_PC_6x75 {
+struct G_UpdateQuestFlag_DC_PC_6x75 {
   G_UnusedHeader header;
   le_uint16_t flag = 0; // Must be < 0x400
   le_uint16_t action = 0; // 0 = set flag, 1 = clear flag
 } __packed__;
 
-struct G_SetQuestFlag_V3_BB_6x75 {
-  G_SetQuestFlag_DC_PC_6x75 basic_cmd;
+struct G_UpdateQuestFlag_V3_BB_6x75 : G_UpdateQuestFlag_DC_PC_6x75 {
   le_uint16_t difficulty = 0;
   le_uint16_t unused = 0;
 } __packed__;
diff --git a/src/ReceiveSubcommands.cc b/src/ReceiveSubcommands.cc
index 09f8685d..02166975 100644
--- a/src/ReceiveSubcommands.cc
+++ b/src/ReceiveSubcommands.cc
@@ -1689,14 +1689,14 @@ static void on_set_quest_flag(shared_ptr<Client> c, uint8_t command, uint8_t fla
 
   uint16_t flag_index, difficulty, action;
   if (is_v1_or_v2(c->version()) && (c->version() != Version::GC_NTE)) {
-    const auto& cmd = check_size_t<G_SetQuestFlag_DC_PC_6x75>(data, size);
+    const auto& cmd = check_size_t<G_UpdateQuestFlag_DC_PC_6x75>(data, size);
     flag_index = cmd.flag;
     action = cmd.action;
     difficulty = l->difficulty;
   } else {
-    const auto& cmd = check_size_t<G_SetQuestFlag_V3_BB_6x75>(data, size);
-    flag_index = cmd.basic_cmd.flag;
-    action = cmd.basic_cmd.action;
+    const auto& cmd = check_size_t<G_UpdateQuestFlag_V3_BB_6x75>(data, size);
+    flag_index = cmd.flag;
+    action = cmd.action;
     difficulty = cmd.difficulty;
   }