diff --git a/src/ItemData.cc b/src/ItemData.cc
index 2bd7ff24..6ba25957 100644
--- a/src/ItemData.cc
+++ b/src/ItemData.cc
@@ -262,9 +262,17 @@ void ItemData::add_mag_photon_blast(uint8_t pb_num) {
   }
 }
 
+uint16_t ItemData::get_sealed_item_kill_count() const {
+  return ((this->data1[10] << 8) | this->data1[11]) & 0x7FFF;
+}
+
 void ItemData::set_sealed_item_kill_count(uint16_t v) {
-  this->data1[10] = (v >> 8) | 0x80;
-  this->data1[11] = v;
+  if (v > 0x7FFF) {
+    this->data1w[5] = 0xFFFF;
+  } else {
+    this->data1[10] = (v >> 8) | 0x80;
+    this->data1[11] = v;
+  }
 }
 
 uint8_t ItemData::get_tool_item_amount() const {
diff --git a/src/ItemData.hh b/src/ItemData.hh
index 6bdf3257..8a07ba3f 100644
--- a/src/ItemData.hh
+++ b/src/ItemData.hh
@@ -129,6 +129,7 @@ struct ItemData { // 0x14 bytes
   bool mag_has_photon_blast_in_any_slot(uint8_t pb_num) const;
   void add_mag_photon_blast(uint8_t pb_num);
 
+  uint16_t get_sealed_item_kill_count() const;
   void set_sealed_item_kill_count(uint16_t v);
   uint8_t get_tool_item_amount() const;
   void set_tool_item_amount(uint8_t amount);
diff --git a/src/ReceiveSubcommands.cc b/src/ReceiveSubcommands.cc
index cf650352..17c34039 100644
--- a/src/ReceiveSubcommands.cc
+++ b/src/ReceiveSubcommands.cc
@@ -1497,8 +1497,16 @@ static void on_enemy_killed_bb(shared_ptr<ServerState> s,
       if (leveled_up) {
         send_level_up(l, other_c);
       }
+    }
+  }
 
-      // TODO: Update kill counts on unsealable items
+  // Update kill counts on unsealable items
+  auto& inventory = c->game_data.player()->inventory;
+  for (size_t z = 0; z < inventory.num_items; z++) {
+    auto& item = inventory.items[z];
+    if ((item.flags & 0x08) &&
+        s->item_parameter_table->is_unsealable_item(item.data)) {
+      item.data.set_sealed_item_kill_count(item.data.get_sealed_item_kill_count() + 1);
     }
   }
 }